From my point of view, I believe that the main cause of global warming is human activities. For example: the concentration of carbon dioxide has increased because of the human activities and the fossil fuels. Population growth is also a disaster. The increase of people means more food, and more methods of transportation. That means more methane because there will be more burning of fossil fuels. More people also mean more cars and more cars means more pollution. Also, many people have more than one car. Consequently, despite this above, global warming can solve by many way. However, I will talk about these solutions in the near future.
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