1. Clean renewable Resources. The author is saying that there are many resources that can be used, that are clean, and are better for the environment. They are not that expensive and could be the answer to global warming.
2. Related key words are, clean, reusable, windmills, fossil fuels, and energy. The author focuses on different types, and explaining them in depth so that the reader can better understand a smarted way of life.
3. I would first you dig.com to narrow my search. Then in the search box i would type in Clean air/ renewable fuel sources/etc. articles. To see that others say. Then find a page that tells and explains the sources, not just in opinions but all facts.
4. Yes, the author have valid points that I agree with. The author says that something needs to be done before its too late, but we cant do it alone, everyone needs to chip in, and help make the world a better place.
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