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...Environment for general studies upsc civil services exam websites https www pmfias com and store facebook page poormansfriend youtube c newsletter newsletters pdf ecology biosphere habitat ecosystem components of an principles organizations levels in ecotone functions ecological succession stages homeostasis energy flow through trophic food chain web pyramids pollutants level biomagnification biogeo chemical cycling or nutrient types cycles carbon cycle gaseous nitrogen natural biomes terrestrial ecosystems tundra biome taiga boreal temperate deciduous north western europe british type climate rainforest sub tropical eastern china south usa steppe grassland mediterranean monsoon savanna wet dry rain forest desert aquatic organisms factors limiting the productivity habitats wetland ramsar convention on wetlands estuarine mangroves global environmental issues degradation major causes consequences air pollution classification their sources effects prevention control acid acidification...