Each year we pump at least six billion tons of heat-trapping carbon into the innermost layer of our atmosphere, whose outer extent is only about twelve miles overhead. According to an IPCC (United Nations' Intergovernmental Panel on Climate Change) report released this year, atmospheric CO2 will, if the buildup is left unchecked, double from its pre-industrial level within the next century. That doubling of CO2 correlates with an increase in the global temperature of at least three to eight degrees Fahrenheit. The last ice age was just five to nine degrees colder than our current climate.

Our planet has run out of patience. So has our sense of justice. It is time to step it up - and up - and up - until we reach the only goal that really matters: peace among people and peace between people and nature.

The largest source of greenhouse gases in the coming decades will not be the US, Western Europe and Japan, but the developing economies of East Asia, Latin America and Eastern Europe. The coming eruption of carbon emissions from the poor world will dwarf any reductions in the North.

It's very important to understand that climate change is not just another issue in this complicated world of proliferating issues. Climate change is THE issue which, unchecked, will swamp all other issues.

Ultimately, I believe - because energy is so central to our lives - that a common global project to rewire the world with clean energy could be the first step on a path to global peace and global democracy - even in today's deeply troubled world.

Absent the rapid mobilization of climate advocates at every level - and the pooling of all their energy, creativity, and resources into a coordinated, no-holds-barred campaign - we will soon be crossing the threshold into climate hell.

Each year we pump at least six billion tons of heat-trapping carbon into the innermost layer of our atmosphere, whose outer extent is only about twelve miles overhead. According to an IPCC (United Nations' Intergovernmental Panel on Climate Change) report released this year, atmospheric CO2 will, if the buildup is left unchecked, double from its pre-industrial level within the next century. That doubling of CO2 correlates with an increase in the global temperature of at least three to eight degrees Fahrenheit. The last ice age was just five to nine degrees colder than our current climate.