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Radiation in Chernobyl. Oil spills, eg Gulf War. Nuclear disaster in Hiroshima. Soil pollution, such as from buried refuse, acid rain, pesticides, etc. Air pollution, such as from traffic, power stations, burning waste etc. You can discuss all of these affecting humans by considering the impact on crops (soil pollution), health (radiation, air pollution, contaminated crops), scarcity of resources (soil pollution, oil spills, radiation) and many others.