Why don’t we use only renewable energy like Solar and wind power?

Why can’t we just make the change? Train people in the coal industry to work in these new industry’s.
Wind turbines are only 15% efficient - so they are a waste of time/money.
They are only there as a "we are doing something" show for politicians - oh and did I mention our electricty bills are [...]

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What is the most used form of renewable energy: solar or wind power? (In Maine, USA)?

what is most used form of energy in Maine? Wind vs. Solar Energy? Which produces most megawatts, and which is owned more? No oppinions please, just please have proof. (websites, books ect)
Can’t find figures for Maine.
USA-wide, there is far more wind power than solar power:
http://www.maine.gov/oeis/docs/OEIS%20Comp%20Energy%20Plan.pdf
Over 34,000MW USA-wide, with 175MW in Maine:
http://www.windpoweringamerica.gov/wind_installed_capacity.asp
They think solar across the [...]

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Should solar power be the dominant energy-source of the 21st century?

Hasn’t solar power technically been the dominant energy-source of all the other centuries?
No, Let’s rely on the middle east oil, Thank God US is dealing with a terrorist country like Saudi Arabia!

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How renewable energy solar power works?

My father is asking me to post a question about this.He is planning to buy an alternative renewable energy resources.Is it true that you will save electricity from alternative home energy solutions? Any suggestions and help on this post is highly appreciated thanks.
You can use renewable energy sources since it can be replenished in a [...]

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Will space colonies that get their energy from solar power not thermally pollute the solar system? Defend your

Will space colonies that get their energy from solar power not thermally pollute the solar system? Defend your answer.
there’s the whole question
Thermal radiation from such colonies would leave the solar system at the speed of light, the same as un-captured sunlight.  Nothing would hang around to behave as a pollutant.

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