EL KADIRI ACHRAF Homework : 1. The main cause of global warming is from an increase in greenhouse gases (like carbon dioxide, methane and Nitrous Oxide) in the atmosphere. 2. fertilizer and pesticides can cause the contamination of land and threaten food security. 3. the greenhouse effect is that it trap the heat from the sun, which is making the Earth hotter 4. Rainforests help to control global warming because they absorb carbon dioxide 5. type of soil do rainforests grow on are poor soils, it’s a problem because when they are cut down or burned the soil is washed away in tropical rains, so that the area may turn into desert. 6. Countries use the most renewable energy are Iceland and Costa Rica. 7. Train is better than plane because As more and more people fly, greenhouse gases increase, and emissions from aviation in Europe increased by 87% between 1990 and 2006, but using public transport (includes trains) or cycling in cities emissions from urban transport could be cut by more than 50%. 8. The effective thing than recycling is choosing products that use a minimum of plastic and paper packaging.