The first President Bush didn't sign 1993 Rio Treaty
Thomas Friedman wrote:
"How could Republicans become so anti-environment, just when the country is going green? Historically speaking, 'Republicans can claim as much credit for America’s environmental leadership as Democrats,' noted Glenn Prickett, senior vice president at Conservation International. 'The two greatest environmental presidents in American history were Teddy Roosevelt, who created our national park system, and Richard Nixon, whose administration gave us the Clean Air Act and the Environmental Protection Agency.' George Bush Sr. signed the 1993 Rio Treaty, to preserve biodiversity."
That last sentence about President Bush signing the 1993 Rio Treaty to preserve biodiversity is false.
http://lawreview.wustl.edu/inprint/76-1/761-18.html (See paragraphs four and five)
http://www.loe.org/shows/segments.html?programID=93-P13-00017&segmentID=2 (see third question in transcript)
http://sovereignty.net/p/land/biotreatystop.htm (see the third section, titled "The Treaty")