The human species during its brief time on Earth has exhibited a remarkable capacity to kill itself off. The Cro-Magnons dispatched the gentler Neanderthals. The conquistadors, with the help of smallpox, decimated the native populations in the Americas. Modern industrial warfare in the 20th century took at least 100 million lives, most of them civilians. And now we sit passive and dumb as corporations and the leaders of industrialized nations ensure that climate change will accelerate to levels that could mean the extinction of our species. Homo sapiens, as the biologist  Tim Flannery  points out, are the “future-eaters.”

In the past when civilizations went belly up through greed, mismanagement and the exhaustion of natural resources, human beings migrated somewhere else to pillage anew. But this time the game is over. There is nowhere else to go. The industrialized nations spent the last century seizing half the planet and dominating most of the other half. We giddily exhausted our natural capital, especially fossil fuel, to engage in an orgy of consumption and waste that poisoned the Earth and attacked the ecosystem on which human life depends. It was quite a party if you were a member of the industrialized elite. But it was pretty stupid.

Collapse this time around will be global. We will disintegrate together. And there is no way out. The 10,000-year experiment of settled life is about to come to a crashing halt. And humankind, which thought it was given dominion over the Earth and all living things, will be taught a painful lesson in the necessity of balance, restraint and humility. There is no human monument or city ruin that is more than 5,000 years old. Civilization, Ronald Wright notes in “A Short History of Progress,” “occupies a mere 0.2 percent of the two and a half million years since our first ancestor sharpened a stone.” Bye-bye, Paris. Bye-bye, New York. Bye-bye, Tokyo. Welcome to the new experience of human existence, in which rooting around for grubs on islands in northern latitudes is the prerequisite for survival.

We view ourselves as rational creatures. But is it rational to wait like sheep in a pen as oil and natural gas companies, coal companies, chemical industries, plastics manufacturers, the automotive industry, arms manufacturers and the leaders of the industrial world, as they did in Copenhagen, take us to mass extinction? It is too late to prevent profound climate change. But why add fuel to the fire? Why allow our ruling elite, driven by the lust for profits, to accelerate the death spiral? Why continue to obey the laws and dictates of our executioners?

The news is grim. The accelerating disintegration of Arctic Sea ice means that summer ice will probably disappear within the next decade. The open water will absorb more solar radiation, significantly increasing the rate of global warming. The Siberian permafrost will disappear, sending up plumes of methane gas from underground. The Greenland ice sheet and the Himalayan-Tibetan glaciers will melt. Jay Zwally, a NASA climate scientist, declared in December 2007: “The Arctic is often cited as the canary in the coal mine for climate warming. Now, as a sign of climate warming, the canary has died. It is time to start getting out of the coal mines.”

But reality is rarely an impediment to human folly. The world’s greenhouse gases have continued to grow since Zwally’s statement. Global emissions of carbon dioxide (CO2) from burning fossil fuels since 2000 have increased by 3 per cent a year. At that rate annual emissions will double every 25 years. James Hansen, the head of NASA’s Goddard Institute for Space Studies and one of the world’s foremost climate experts, has warned that if we keep warming the planet it will be “a recipe for global disaster.” The safe level of CO2 in the atmosphere, Hansen estimates, is no more than 350 parts per million (ppm). The current level of CO2  is 385 ppm and climbing. This already guarantees terrible consequences even if we act immediately to cut carbon emissions.