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ecology --- ecology --- environment --- environment --- cycling --- cycling --- energy --- energy --- Climatology --- Climatology --- ecosystems --- ecosystems --- Pollution --- Pollution

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Cycling --- Human mechanics --- Bicycling --- Biomechanical Phenomena --- Sports --- Physiological aspects

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Écologie --- ecology --- Niveau trophique --- Trophic levels --- Cycle biogéochimique --- cycling --- Photosynthèse --- Photosynthesis --- Pollution --- Ressource naturelle --- Natural resources --- Biocénose --- biocoenosis --- Dégradation --- degradation --- Conservation de la nature --- Nature conservation --- degradation. --- NATURAL RESOURCE CONSERVATION --- RADIOACTIVITY --- WATER POLLUTION --- SOIL POLLUTION --- AIR POLLUTION --- HUMANS --- BIOSPHERE --- MANUALS --- ECOLOGY --- NATURAL RESOURCES --- WASTES --- IMPACT --- STUDY --- DEGRADATION --- POLLUTION --- INTERACTIONS --- UTILIZATION --- WASTE