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Black carbon is a common air pollutant found in many urban areas around the world. Black carbon primarily comes from the incomplete combustion of fossil fuels, biomass, and biofuels. Sources of black carbon emissions can include transportation (e.g., cars, trucks, buses), industrial processes, and residential cooking and heating (e.g., wood-burning stoves).
Finish the following sentences using a preposition:
1. Renewable energy sources can be reformed naturally in a short period of time. They are not used .up.. when the energy is exploited.
2. Using coal as a major energy source is not a good idea. It's running .out..
3. Biogas system is introduced ..to. poor people because it supplies people ..with. electricity.
4. Garbage is burned .to.. produce steam ..for. making electricity or to provide heat ..to. industries and home.
5. The new crop of corn takes .up.. the carbon dioxide ..from. the air to reduce air pollution.
contributes to global warming.
ending def _________ 
at the COP.
has increased the amount of gre______ ________ 
in the earth's atmosphere.
2. emission - deforestation
3. fossil fuels - greenhouse effects
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