II. Put the correct word for the sentences below. deforestation preserve greenhouse effect fossil fuels damage depletion pollute global warming 1. The ____ _____ occurs when the earth's atmosphere traps certain gases such as carbon dioxide as well as water vapour. This makes the earth's surface warmer. 2. ________________ is harm or injury that makes something less valuable or able to function. 3. To ____________________ is to keep and protect something from damage, change or waste. 4. __________________ are non-renewable energy sources such as coal, fuel oil and natural gas formed from dead plants and animals underground. 5. ___ ________________ is the gradual increase of temperature on the earth's surface due to greenhouse effect. 6. ______ ____________ ______ is the using up or reducing something like energy or resources. 7. To _________________is to make air, water, or soil dirty or unclean. 8. _________________ is the removal or cutting down of all trees in an area for urban use and farm lands.