This year, they are declining even to attend, instead sending environment ministers and playing down the talks as much as possible.
The process is dogged by a disagreement over the best way to limit the growth in greenhouse gases, which are blamed by scientists for rising temperatures. Environmentalists believe the best approach is a binding treaty that will force all countries to cut carbon emissions. But at the last major meeting before the Cancun summit, held in China last week, delegates were still in dispute.'
Read more: Global Warming Summit Heads for Failure Amid Snub by World Leaders