No need to panic? Taken from
http://abcnews.go.com/Technology/wireStory?id=628003:over the past 50 years humans had changed ecosystems more rapidly and extensively than any comparable period in human historyAnd it doesn't come from a simple statement:
The four-year, $24 million Millennium Ecosystem Assessment...The study was compiled by 1,360 scientists from 95 nations who pored over 16,000 satellite photos from the U.S. National Aeronautics and Space Administration, and analyzed statistics and scientific journals>
http://www.cato.org/testimony/ct-pm072998.html>
>No need to panic. Maybe there isn't the need to spend trillions of $s after all. US is doing more then its part to control so called "green house" effect.