The first international conference of Green Party politicians and supporters voted unanimously today to launch a boycott against U.S.-based oil companies in retribution for President Bush’s decision to withdraw from the Kyoto treaty on climate change. Australian Sen. Bob Brown, who chaired the meeting of the Greens in Canberra, Australia, said Bush was choosing the welfare of oil companies over the health of future generations. Brown said, "The world’s got a pretty simple choice here. It’s between President Bush and our grandchildren." About 800 delegates from 70 countries attended the conference.