Tuvalu, a nation of nine islands, is taking steps to completely rely on renewable energy by 2020.
Italy's leader deemed the event a logistical 'miracle' after a last-minute change of venue. But critics decried lack of concrete progress on climate change, Iran, and trade.
In the post-Bush era, the major industrial nations meeting this week face pressure to set firm temperature and emission-reduction goals.
This week, negotiators from 182 countries meet in Bonn, Germany to lay the groundwork for a post-Kyoto climate regime.
Obama science adviser suggests geoengineering to combat climate change.
Since 1970s, loose association of conservation-minded urban areas has grown up worldwide.