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Doole

- Fatou Laobe (performer, composer), Mareme Ndiaye, Kouna Sow, Aissata Sow, Law Kouyate (chorus), Mbeya Samb (bass guitar), Assana Aldara (guitar), Azizi Diallo (piano), Beydi Thior (pianos), Law Kouyate (kora), Amadou Athiel (xalam), Moussa Gningue (drums), Elle Mbaye, Mbaye Thiam (sabar), Jololi

Doumale

- Brighess (author, composer, lead singer, chorus, percussions), Turbo (chorus), Le Ziboua Stars (band), Cisky de Panza (chorus, guitar, arranger), Ras live I

Dramedjeli

- Adama Drame (performer, arranger, composer, djembe, tama, doumdoum, chekere, voice, harmonica), Yacouba Kone (djembe), Bakari Doumbia (zin-zin), Mamadou Diabate ( balafon), Djesou Mory Kante (accoustic and electric guitar), Adjara Cisse (lead vocal), Oulare, Mariame Sylla, Tagaly (chorus), Adama Troare (accoustic guitar), Augustin Lompo (bass), Bassirou Sanou (flute), Tinminu Adio (tama), Brass: Andre Laourou, Dadie, Franck Desamin, Dramane Kienou (djembe accompaniment), Lamine Soumano (kora), Seydoni Production B.F.

Droit de l'Enfant (Akhi Dawni)

- Pap Jibi Ba (lead vocal), Ndeye Marie Ndiaye, Zacaria Niang, Ousmane Seck (vocals), Cheikh Tidiane Tall (guitar), Pape Ndiaye (sabar, talmba tamb), Dame Mbaye (xalam), Studio 2000

Dynamic compensation for performance characteristic differences of wind generator coupled pumps

- Swanepoel, Pieter Frederick Renier

  • Authors: Swanepoel, Pieter Frederick Renier
  • Date: 2000
  • Subjects: Wind pumps
  • Language: English
  • Type: Thesis , Masters , MTech
  • Identifier: vital:10806 , http://hdl.handle.net/10948/25 , Wind pumps
  • Description: The lack of services such as electricity in the rural areas of South Africa has given rise to the use of pump water and the windmills. The ones in use currently are maintenance intensive. There is a corrosive element in water and this sometimes requires plastic or other non-corrosive materials to be used for pump components and pipes. Solar panels are expensive and have low efficiencies. Alternative energy systems such as diesel engine driven- mono pumps or -turbines or windmills are costly, which means that the overall efficiency must be maximized to reduce these costs.
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  • Date Issued: 2000

Ecoute Fils

- Didier Sourou Awadi aka DJ Awadi (performer), Amadou Barry aka Doug E Tee or Duggy-Tee (performer), Positive Black Soul (band name aka PBS), MALI K7 S.A. Ali Furka Toure Associe, Bamako

Education for environmental literacy : towards participatory action research in the secondary school science curriculum in Lesotho

- Mokuku, Tsepo

  • Authors: Mokuku, Tsepo
  • Date: 2000
  • Subjects: Environmental education -- Lesotho , Science -- Study and teaching (Secondary) -- Lesotho
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:1503 , http://hdl.handle.net/10962/d1003385 , Environmental education -- Lesotho , Science -- Study and teaching (Secondary) -- Lesotho
  • Description: The dependency of educators in Lesotho on externally developed curriculum theories and concepts is fundamental to issues of relevance of the school curricula. This study set out to develop the meaning of environmental literacy in the context of three secondary schools and to explore appropriate teaching methods for the development of this concept in the science curriculum. The participatory action research process involved a team of four science teachers, including the researcher, in partnership with an environmental centre. We progressively developed the meamng of environmental literacy by monitoring teaching innovations in the classroom, holding meetings and workshops and attending conferences where we shared classroom findings and reflected on our emerging understandings based on classroom experiences. Data collection involved: audio-recording of classroom lessons, interviews with teachers and students, audio-visual recording, classroom observations and students' questionnaires. The research process made apparent the complex nature of the process of clarifying and developing environmental literacy in this context. Classroom actiyities planned to inform the team's understanding of the meaning of environmental literacy and develop appropriate teaching methods encountered constraints associated with the education system and the legacy of colonialism. These contextual constraints crystallised the need for the education system to be transformed in order to make schools more conducive environments for the gevelopment of students' environmental literacy. While initially teachers were reluctant to engage in critical reflection, the research process did encourage the team to revise and expand their understandings of both environmental literacy in the science classroom, and the action research itself. The emerging meaning of environmental literacy in this context and how it may be developed among students does not involve a definition with prescriptive, effective teaching methods, but provides insights and understandings gained by the participants in their engagement with a reflective process of reconslructing meaning. I have come to understand environmental literacy during the study to be a process that should draw strongly on the local knowledge and understandings into the science curriculum, through participatory process-based curriculum development models.
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  • Date Issued: 2000

Effect of water temperature on the biogeography of South African estuarine fishes associated with the subtropical/warm temperate subtraction zone

- Maree, R C, Booth, Anthony J, Whitfield, A K

  • Authors: Maree, R C , Booth, Anthony J , Whitfield, A K
  • Date: 2000
  • Language: English
  • Type: text , Article
  • Identifier: vital:7133 , http://hdl.handle.net/10962/d1011776
  • Description: Estuarine biogeographical regions along the southeastern coast of South Africa were investigated in terms of fish distribution and abundance patterns, with particular emphasis on the role of water temperature in influencing these patterns. Qualitative and quantitative analyses were conducted upon the ichthyofaunal assemblages to determine whether the location of the subtropical/warm temperate boundary corresponds to that proposed by Whitfield.(n1) Analyses included the distribution ranges of species associated with estuaries according to presence/absence data, cluster analysis of gill net catches in eight estuaries along the southeastern coast and the relative proportion of tropical to temperate marine species within these eight systems. Quantitative analysis indicated that the ichthyofaunal biogeographical regions are indeed a reflection of water temperature regimes and that the subtropical/warm temperate boundary is located between the Great Kei and Mbashe estuaries. A strong negative correlation was found between the number of temperate fish species and the mean of the minimum monthly temperatures recorded in the systems studied. Qualitative analysis revealed that a barrier appears to exist in the vicinity of the Swartkops estuary, which prevents the westward migration of tropical 'vagrants'. The influence of the Agulhas Current along the east coast and its divergence from the coastline in the Algoa Bay region, as well as upwelling phenomena on the southeast and south coasts are identified as major factors that influence marine and estuarine temperature regimes and therefore the ichythyofauna of this region.
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  • Date Issued: 2000

Effect of water temperature on the biogeography of South African estuarine fishes associated with the subtropical/warm temperate subtraction zone

- Maree, R C, Booth, Anthony J, Whitfield, A K

  • Authors: Maree, R C , Booth, Anthony J , Whitfield, A K
  • Date: 2000
  • Language: English
  • Type: Article
  • Identifier: vital:6766 , http://hdl.handle.net/10962/d1008043
  • Description: Estuarine biogeographical regions along the southeastern coast of South Africa were investigated in terms of fish distribution and abundance patterns, with particular emphasis on the role of water temperature in influencing these patterns. Qualitative and quantitative analyses were conducted upon the ichthyofaunal assemblages to determine whether the location of the subtropical/warm temperate boundary corresponds to that proposed by Whitfield.(n1) Analyses included the distribution ranges of species associated with estuaries according to presence/absence data, cluster analysis of gill net catches in eight estuaries along the southeastern coast and the relative proportion of tropical to temperate marine species within these eight systems. Quantitative analysis indicated that the ichthyofaunal biogeographical regions are indeed a reflection of water temperature regimes and that the subtropical/warm temperate boundary is located between the Great Kei and Mbashe estuaries. A strong negative correlation was found between the number of temperate fish species and the mean of the minimum monthly temperatures recorded in the systems studied. Qualitative analysis revealed that a barrier appears to exist in the vicinity of the Swartkops estuary, which prevents the westward migration of tropical 'vagrants'. The influence of the Agulhas Current along the east coast and its divergence from the coastline in the Algoa Bay region, as well as upwelling phenomena on the southeast and south coasts are identified as major factors that influence marine and estuarine temperature regimes and therefore the ichythyofauna of this region.
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  • Date Issued: 2000

Effect of wave exposure on growth and mortality rates of the mussel Perna perna: bottom up regulation of intertidal populations

- McQuaid, Christopher D, Lindsay, Tracy L

  • Authors: McQuaid, Christopher D , Lindsay, Tracy L
  • Date: 2000
  • Language: English
  • Type: Article
  • Identifier: vital:6955 , http://hdl.handle.net/10962/d1011994
  • Description: The effect of wave exposure on the growth of low-shore populations of Perna perna (Linnaeus) was determined using 3 independent approaches at 6 sites on the south coast of South Africa: (1) Individual marking; notches were filed on the growing edges of mussels in situ. After 111 d, growth from the mark to the new growing edge was measured. (2) Internal shell-growth bands; mussels from the mark recapture experiment were used to establish that growth bands are laid down tidally. Unmarked individuals were then used to measure growth over the last 60 tides. (3) Shepherd¹s length-composition analysis (SLCA); growth rates were determined from length-frequency distributions in 11 samples collected at 6 wk intervals over 15 mo. All 3 approaches showed that growth rate was approximately twice as fast on exposed as on sheltered shores (ANCOVA, p < 0.05 in all cases). Mean length for the first year of growth (averaged for the 3 methods) was 47 and 22 mm, respectively. There were, however, considerable differences among methods. Marking provided the lowest estimates of growth rates, and SLCA the highest. The mean mortality index (Z yr-1) was significantly higher and annual survival rate lower for exposed shores, indicating faster turnover under exposed conditions. Mean longevity on exposed shores (2.6 yr) was only one-third of estimated longevity on sheltered shores (6.7 yr). These findings show that degree of exposure has important interactions with growth and mortality of mussels on the low shore, and that these effects are independent of the effects of exposure on density. The findings also indicate strong bottom up regulation of mussel populations.
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  • Date Issued: 2000

Effects of sustained elevated CO2 concentration and Nitrogen nutrition on wheat (Triticum aestivum L. cv Gamtoos)

- Kgope, Barney Stephen

  • Authors: Kgope, Barney Stephen
  • Date: 2000
  • Subjects: Wheat -- Growth , Wheat -- Nutrition , Nitrogen fertilizers , Nitrogen in agriculture
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4205 , http://hdl.handle.net/10962/d1003774 , Wheat -- Growth , Wheat -- Nutrition , Nitrogen fertilizers , Nitrogen in agriculture
  • Description: There is consensus that high CO2 results in enhanced growth and yield for most crop plants. However, most of these studies were carried out in the presence of adequate nutrients, which is also the case in agricultural systems (managed ecosystems). About 20% of the earth’s land mass have sufficiently low levels of nutrients to cause some kind of stress to plants. On the other hand, elevated [CO2] decreases foliar nutrient elements in plants and as a result partitioning of certain nutrient elements in plants is altered. Little data is available on the partitioning of most nutrient elements in plants, and this will definitely impact on growth and yield. To investigate this, wheat (Triticum aestivum L. c.v. Gamtoos) was grown in controlled environment cabinets at 360 and 700 µmol mol -1 CO2. The full Long-Ashton nutrient solution comprising of three-nitrogen concentrations ([N]) viz. (4,6 and 12 mM) was used to water plants everyday. The measurement of net assimilation rate (NAR), stomatal conductance (gs), transpiration rate (E), water use efficiency (WUE), foliar [N], nitrogen use efficiency (NUE) and growth parameters (total plant biomass (TPB), total plant height (TPH), leaf area (LA), shoot and root dry weight) were made 7 days after germination (7 DAG) till the onset of flowering. The increase in nitrogen supply in the order of 4, 6 and 12mM resulted in an increase in NAR, g_s_ , WUE and a decline in E under elevated [CO2]. Under elevated [CO2] NAR was observed to increase during the first two weeks reaching its maximum at 14 DAG, thereafter followed by a decline reaching its maximum at 28 DAG. This was later followed by an increase at 35 DAG onwards. Under elevated [CO2], NAR was increased significantly between the nitrogen regimes during the first (7-14 DAG) and the last two (35-42 DAG) weeks. The response of assimilation as a function of internal [CO2] (Ci), showed a decrease with age at ages 14, 28 and 35 DAG. This negatively affected the initial slope and the CO2 saturated photosynthetic rates under all treatments. This suggest that acclimation may have been as a result of both stomatal and biochemical limitations. All the photosynthetic pigment levels (chl_a_, chl_b_, chl_(a+b)_, and C_(x+c)_ ) increased with an increase in nitrogen supply from 4 to 6mM [N]. A 12mM [N] resulted in a significant decline in the photosynthetic pigment levels compared to a 6mM [N]. Chla remained higher than chlb under all treatments. Also, NAR was seen to increase and decrease concomitantly with the photosynthetic pigment levels. Foliar [N] was seen to decrease with an increase in nitrogen supply from 4 to 6 mM [N] under elevated [CO2] and the effects were adverse under the 4mM [N]. Under the 6mM N regime foliar [N] was positively correlated to NAR for elevated [CO2] grown plants. Similarly, E was positively correlated to foliar [N] under the same conditions. Elevated CO2 and increase in nitrogen supply had a pronounced effect on total plant height (TPH), total plant biomass (TPB), leaf area (LA), shoot and root dry weight and nitrogen use efficiency (NUE). The effects were more pronounced under a 6mM [N] as a result of high NUE. However, under 12mM [N] growth was not as expected as a result of lower NUE. Under all treatments shoot dry weight (SDW) was positively correlated to NUE. Anatomical studies revealed that total leaf and midrib thickness was significantly increased with an increase in nitrogen supply under elevated CO2 to support the larger leaf areas. There were no significant changes in the chloroplast ultrastructure as a result of the increase in nitrogen supply and CO2 enrichment. Starch grain surface area was seen to decline with an increase in nitrogen under both ambient and elevated CO2. Elevated CO2 and increase in nitrogen supply significantly increased total grain dry weight per plant by 47 and 46% respectively under 6 and 12mM [N]. In contrast, the increase was by about 21, 61 and 67% respectively under 4, 6 and 12mM [N] between the CO2 regimes.
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  • Date Issued: 2000

El hadji Diakali Toure

- Saly Sidibe, Harouna Bary (arrangement), Adama Drame (guitar solo), Batass (bass guitar), Lamine Camara (electric piano), Mamadou Koita (Djembe), Sidi Coulibaly (drums), Awa Diabate, Sanota Doumbie (chorus), Ali Landoure

Electrocatalytic behavior of substituted cobalt phthalocyanines towards the oxidation of cysteine

- Maree, Suzanne, Nyokong, Tebello

  • Authors: Maree, Suzanne , Nyokong, Tebello
  • Date: 2000
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/293268 , vital:57070 , xlink:href="https://doi.org/10.1016/S0022-0728(00)00281-3"
  • Description: Ring substituted cobalt phthalocyanine complexes of the form CoPc(X)4, (where X=NH2, NO2, C(CH3)3, SO3H and COOH) are compared for their catalytic activities towards the oxidation of cysteine. The potential for the electrocatalytic oxidation of cysteine is closely related to the CoIII/CoII couple of the CoPc(X)4 complexes in acidic media and to the CoII/CoI couple in basic media. The catalytic currents and the oxidation potential for cysteine are dependent on the pH of the solution, the potential becoming less positive as the pH increases and the catalytic currents decreasing with increase in pH, for the same concentration of cysteine. The magnitudes of the catalytic currents (after ten scans) for cysteine oxidation at pH 8.3 and on electrodes modified with the CoPc(X)4 complexes increased with the nature of the ring substituent as follows: NO2 less than NH2 less than SO3H less than C(CH3)3 less than COOH.
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  • Date Issued: 2000

Electrocatalytic behavior of substituted cobalt phthalocyanines towards the oxidation of cysteine

- Maree, Suzanne, Nyokong, Tebello

  • Authors: Maree, Suzanne , Nyokong, Tebello
  • Date: 2000
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/293185 , vital:57063 , xlink:href="https://doi.org/10.1016/S0022-0728(00)00281-3"
  • Description: Ring substituted cobalt phthalocyanine complexes of the form CoPc(X)4, (where X=NH2, NO2, C(CH3)3, SO3H and COOH) are compared for their catalytic activities towards the oxidation of cysteine. The potential for the electrocatalytic oxidation of cysteine is closely related to the CoIII/CoII couple of the CoPc(X)4 complexes in acidic media and to the CoII/CoI couple in basic media. The catalytic currents and the oxidation potential for cysteine are dependent on the pH of the solution, the potential becoming less positive as the pH increases and the catalytic currents decreasing with increase in pH, for the same concentration of cysteine. The magnitudes of the catalytic currents (after ten scans) for cysteine oxidation at pH 8.3 and on electrodes modified with the CoPc(X)4 complexes increased with the nature of the ring substituent as follows: NO2 less than NH2 less than SO3H less than C(CH3)3 less than COOH.
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  • Date Issued: 2000

Electrocatalytic properties of vitamin B12 towards oxidation and reduction of nitric oxide

- Vilakazi, Sibulelo Lea, Nyokong, Tebello

  • Authors: Vilakazi, Sibulelo Lea , Nyokong, Tebello
  • Date: 2000
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/293196 , vital:57064 , xlink:href="https://doi.org/10.1016/S0013-4686(00)00628-9"
  • Description: This paper reports on the catalytic behaviour of cyanocobalamin (VB12) towards the reduction and oxidation of nitric oxide. When VB12 is adsorbed on glassy carbon electrodes, it catalyses the reduction of nitric oxide (NO) in pH 4 and 9 buffers. In the absence of NO, cyclic voltammetry shows that VB12 is reduced by a one-step two-electron reduction from CoIII to the CoI species. Addition of NO at pH 9 to solutions of VB12 resulted in the splitting of the cyclic voltammetry peaks as a result of a consecutive one-electron reduction of the central CoIII metal in VB12 to CoII and finally to CoI. The catalytic peak for oxidation of NO on a glassy carbon electrode modified with VB12 was observed at 1.21 V versus Ag∣AgCl, at pH 9. The products of the catalytic reduction of nitric oxide include ammonia and hydroxylamine.
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  • Date Issued: 2000

Elle est occupee

- Brighess (author, composer, lead singer, chorus, percussions), Turbo (chorus), Le Ziboua Stars (band), Cisky de Panza (chorus, guitar, arranger), Ras live I

Elle est occupee (remix maquis)

- Brighess (author, composer, lead singer, chorus, percussions), Turbo (chorus), Le Ziboua Stars (band), Cisky de Panza (chorus, guitar, arranger), Ras live I

Environmental art and its contribution to establishing an awareness of the sacred in nature

- Matthews, Elaine Katherine Simone

  • Authors: Matthews, Elaine Katherine Simone
  • Date: 2000
  • Subjects: Installations (Art) Art, Modern -- 20th century Nature (Aesthetics)
  • Language: English
  • Type: Thesis , Masters , MFA
  • Identifier: vital:2413 , http://hdl.handle.net/10962/d1002209
  • Description: The introduction establishes the goal of the research, which is to discover that art concerned with re-evaluating the relationship to the environment and spirituality can serve to connect people to one another, and to the environment. The context of the research is the contemporary ecological and spiritual crisis of the postmodern world. The background places the discussion within the contexts of modernism and postmodernism. The historical background focuses on the period from the 1960s to the present day. Land and Environmental artists who work in a manner that is conscious of environmental issues and who suggest a sacred and creative attitude to ecology are discussed. My own creative work which is a response to both ancient and contemporary sites as well as to contemporary theories of art and spirituality is discussed. The four projects, are discussed in chronological order, they are: Quest - A journey into Sacred Space; Gaika's Kop - Sacred Mountain; Labyrinth - Journeys to the Centre; and Transforming the Centre. The conclusion shows that the multi-faceted, intertextual and relativistic philosophy of postmodernism has brought about a significant change in the attitude of humanity towards the environment. Artists who reject the modernist aesthetic and philosophy are making art that emphasises relationship to, rather than separation from the natural world.
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  • Date Issued: 2000

Environmental influences on the daytime vertical distribution of Cape hakes and implications for demersal trawl estimates of hake abundance off the west coast of South Africa

- Maree, R C

  • Authors: Maree, R C
  • Date: 2000
  • Subjects: Hake , Fisheries -- Environmental aspects -- South Africa , Fisheries -- South Africa , Trawls and trawling
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5278 , http://hdl.handle.net/10962/d1005122
  • Description: The demersal fishery off the west coast of South Africa experiences decreased catches per unit effort of hake, Merluccius capensis and M. paradoxus, following the onset of strong south easterly winds. Research has demonstrated that, during daylight hours, Cape hakes migrate vertically in the water column in response to strong south easterly winds, decreasing their availability to the bottom trawl. Hydroacoustic, trawl and environmental data were collected off the West Coast during both calm and wind-swept periods in an attempt to understand the forces that initiate this behaviour, its spatial variability and the implications for demersal trawl estimates of abundance. Near-bottom currents appear to be the primary factor influencing the vertical distribution of the demersal fish community, of which hake constitutes a large proportion, during daylight hours. Correlation between wind and near-bottom currents suggest that the poleward component of the currents increase in velocity within eight hours following the onset of south easterly winds. The fish avoid boundary layers where currents change direction and speed dramatically, and seem to concentrate in waters with relatively stable current regimes. This result questions the assumption of CPUE-based assessment models that hake availability to the bottom trawl is constant or varies randomly. The incorporation of acoustic assessment techniques to demersal surveys has potential, but may be most valuable by supplementing swept-area estimates of abundance, since the sampling efficiency of these methods varies within the water column. The incorporation of wind indices and gear performance data to Cape hake assessment models have been identified as useful considerations for the future.
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  • Date Issued: 2000

Environmental youth clubs in Namibia : what role do, could or should they play in environmental education?

- Botma, Connie

  • Authors: Botma, Connie
  • Date: 2000
  • Subjects: Environmental education -- Namibia Environmental education -- Study and teaching -- Namibia Youth -- Societies and clubs Youth -- Namibia
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1519 , http://hdl.handle.net/10962/d1003401
  • Description: Although the existence of wildlife clubs in Africa dates back to the start of the environmental movement in the 1970s, youth involvement through environmental clubs only commenced in Namibia in 1992. I became involved with the clubs in 1995 when I was employed by the Rossing Foundation Environmental Education Project to encourage, support and coordinate environmental clubs in Namibia. During the last three years the number of Namibian clubs has increased from 20 to ±85, and they are now established in most geographical regions of the country. During my involvement with the clubs I became increasingly interested in the philosophical underpinnings of youth movements like clubs and started questioning what we could expect from the youth and what could be achieved through the clubs. One of my main concerns was whether youth could make a significant improvement to the quality of their lives and their environment through these clubs. The aim of my research was therefore to describe and reflect critically on the role of environmental youth clubs in environmental education in Namibia. My study was guided by a socially critical orientation which emphasises the construction of meaning through social dialogue and critical reflection. I chose an interpretative research strategy and generated data mainly through semi-structured interviews, participant observation, a focus-group discussion and a workshop. Due to the focus of the research I purposefully selected the sample of existing youth clubs to be included in the study. The iterative strategy of gathering and interpreting data in successive cycles allowed for continuous reflection throughout the research process. It also allowed me to identify key patterns and trends in analysing and interpreting the data. The study findings suggest that environmental clubs do playa role in learning about environmental issues; in developing personal and social identity, confidence and a sense of purpose in society; in establishing new and supportive relationships between teachers and learners and with other community resourde people; in creating opportunities and enabling exposure to diverse learning environments, options and alternatives; and ih fostering the orientation and skills needed to effect meaningful d1'inges in the environment. The findings also suggest that environmental clubs could make a significant contribution to environmental education, providing that they incorporate a socially critical orientation, gain greater recognition from significant adults and education officials, collaborate with other projects and organisations, and use guidelines of models such as the action research framework to ensure relevant and effective action projects. The main challenges to environmental clubs in Namibia include changing perceptions that youth do not have much to contribute; improving relationships between clubs, schools and communities; dealing with the tension between the possible disempowering effect of central control and the need for more formalised structures in order to gain official recognition; and developing strategies to ensure the clubs' sustainability in the future.
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  • Date Issued: 2000
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