(2) This topic mainly examines environmental issues. This question is open-ended and can answer common questions around you, such as deforestation, serious water pollution, garbage siege and so on. , if it makes sense.
(3) This topic mainly investigates the methods to solve the smog problem. It can be answered according to the causes of smog, such as planting trees, prohibiting burning straw, including reducing automobile exhaust emissions and so on.
So the answer is:
(1) air pollution
(2) Vegetation destruction and water pollution
(3) Eliminate and purify smoke and dust, reduce waste gas emissions, afforest trees, and prohibit burning straws and straws at will in rural areas.