Renewable energy
Today, a lot of engineers develop renewable energy to dicrease the amount of CO2 emission. For example, solar energy and bio energy, wind-power energy. These are eco-friendly, but they can't become popular all over the world. It has two reasons. First, renewable energy is very expensive. Second, energy like solar and wind-power depend on climate, so it is unstable. That's why researchers estimate that most countries can't stop depending on thermal power generation in the future. However, this study is improving gradually, so I want to help it in the future.
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