The document discusses the negative impacts of human activity on nature, including pollution, deforestation, and climate change effects like global warming. It notes that humans cause wastage of water and food, release black fumes from vehicles and industries, and use non-biodegradable materials. Specific effects highlighted include acid rain damaging sculptures, deforestation through tree killing and shifting cultivation, and the greenhouse effect raising global temperatures and melting ice. Other impacts examined are ozone depletion from CFCs, various types of pollution, and effects of pesticides including economic costs and soil pollution. Diseases in humans and loss of flora and fauna are also addressed.