We can save energy in daily activities. , By burning non-renewable energy, a large amount of harmful gases such as carbon dioxide is released into the environment. , These harmful gases can cause serious respiratory problems and other diseases. , Carbon dioxide contributes to the greenhouse effect which is a cause of climate change and global warming. , Petroleum is the most important energy source for modern society because it is now the main fuel for means of transportation. ,

ESL- Unit 6- Revision

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