We are all going green now. Prius-driving politicians promise to pass laws to reduce carbon emissions, bicycling business people bank on environmentally friendly products while clean-living consumers learn to cut consumption. Millions of us have seen Al Gore's An Inconvenient Truth, the fourth-biggest grossing documentary of all time, while soaring oil prices have refocused our minds on the need to find alternative energy sources. Now global political leaders are heading up the calls for change. After years of frustration for environmental campaigners, ministers at the G8 summit in Hokkaido in July this year agreed to adopt a goal of at least a 50% reduction in global greenhouse gas emissions by the year 2050, an aim that Prime Minister Fukuda of Japan said requires "the wisdom and cooperation of the entire world". Earlier in the year, the finance ministers of the US, UK and Japan wrote a letter to the Financial Times, promising to set up a fund to aid the adoption of clean technologies in the developing world. "We have no choice but to help developing countries reduce the carbon footprint of development and make their economies climate change resilient," they wrote.