Problems with alternative energy sources.

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I assume that you refer to "environmental problems caused by these sources of energy", since the problems solved by these energy sources are pretty self evident and can be found in multiple sites on the net, like
http://library.thinkquest.org/20331/types/renewable.html

For the problems caused, you might want to look at the report made by the "National Center for Policy Analysis" which is a front for the Oil and Coal industry lobby - just look at its board of directors. However, in this report they make some valid points regarding the environmental problems caused by the renewable energy sources.

The report can be found at:
http://www.ncpa.org/studies/renew/renew1.html
I summarized some of the points:
Environmental problem caused by:

Solar panels:

1. Need large areas for panels. Any usage of ...