Personally I blame the media. The tendency to hyperbole is mirrored on this thread.
Either the planet is doomed or
everyone can own Hummer H1's without guilt
The reality is somewhat more subtle. To take a proper objective look at the hard science behind the claims, I would recommend Bjorn Lomborg's excellent book "The Skeptical Environmentalist".
http://www.lomborg.com/
Based on careful analysis of the science he concluded that many of the claims by the green movement were not generally substantiated by the results of the science. One by one, he goes through the litany, as he calls it, of four big environmental fears:
Natural resources are running out.
The population is ever growing, leaving less and less to eat.
Species are becoming rapidly extinct, forests are vanishing and fish stocks are collapsing.
Air and water are becoming ever more polluted.
In each case, he demonstrated that the doom and gloom is wildly exaggerated. Known reserves of fossil fuels and most metals have risen. Agricultural production per head has risen; the numbers facing starvation have declined. The threat of biodiversity loss is real but exaggerated, as is the problem of tropical deforestation. And pollution diminishes as countries grow richer and tackle it energetically.
However here's the interesting part. Even Lomborg agrees that global warming is taking place (and the science he studied supported this). The question then becomes how bad is the problem, how fast is it happening and what to do about it ?
Claims that
www.junkscience.com somehow show that there is no global warming is a bit like using the
www.weeklyworldnews.com to prove the existance of life on other planets. Just because they claim it's true doesn't make it science.....