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| We can’t live without energy and most of that energy comes from fossil fuels like petroleum, coal, and natural gas. It is well known that human activities, such as burning fossil fuels, cause global warming, increasing the overall temperatures of the earth. Other than environmental concerns, fossil fuels are becoming more expensive and will eventually run out. So, we need to find ‘alternative energy’ to replace fossil fuel. Many alternative energy sources have been considered and been in development to reduce the dependency on the fossil fuel. |