There are two major types of energy sources; one is renewable and the (a) _____ is non-renewable. Hydro-carbon or fossil fuels are energy sources that are non-renewable. We have to face real big problems if we (b) ______ on them. Fossil fuels like oil, coal, gas, etc are finite energy resources and so the world eventually will out of them. They will become too expensive in the near (c) _______ Moreover, they will become so damaging for the environment that cannot be (d) ________ They have direct polluting impacts on earth's environment that causes global warming. In contrast, renewable energy sources like wind and solar energy are constantly and naturally (e) ______ .

Question:

There are two major types of energy sources; one is renewable and the (a) _____ is non-renewable. Hydro-carbon or fossil fuels are energy sources that are non-renewable. We have to face real big problems if we (b) ______ on them. Fossil fuels like oil, coal, gas, etc are finite energy resources and so the world eventually will out of them. They will become too expensive in the near (c) _______ Moreover, they will become so damaging for the environment that cannot be (d) ________ They have direct polluting impacts on earth's environment that causes global warming. In contrast, renewable energy sources like wind and solar energy are constantly and naturally (e) ______ .