proportion of people consuming wild roots and tubers at home has declined over time
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NATURAL RESOURCES AND THEIR DEPLETION. ECO FRIENDLY AND ECO-DAMAGING. MARINE OIL SPILLS AND THEIR EFFECT ON MARINE ECOLOGY. SEWAGE DISPOSAL. HOW TO REDUCE CO2 EMISSION IN AN ENVIRONMENT. ROLE OF HUMAN IN ENVIRONMENT PROTECTION. ADVANTAGES OF VARIOUS POWER-GENERATION SOURCES. DISADVANTAGES OF USING CONVENTIONAL POWER- GENERATING METHODS. GLOBAL WARMING. GREEN HOUSE EFFECT. ENDANGERED SPECIES. OIL SPILLS. RECYCLING OF PLASTIC ECOTOURISM ENERGY MANAGEMENT / CONSERVATION.
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