Since this is a long-standing tradition in news shows, magazines and papers, and naturally therefore is something people blog about, I thought I'd offer my view on what the biggest story of the year is.

A lot of people will say it's Iraq. Or the Bush Administration scandals. Or the radical right's Terri Schiavo miscalculation. And sure, those are all big, but not the biggest.

Many would probably say Katrina was the biggest story of the year, but really I think that's only a part of it. The biggest story of the year was -- and still is -- global warming.

Consider just a few of the findings published in the major scientific journals during the last three months:

—Arctic sea ice is melting fast. There was 20 percent less of it than normal this summer, and as Dr. Mark Serreze, one of the researchers from Colorado's National Snow and Ice Data Center, told reporters, "the feeling is we are reaching a tipping point or threshold beyond which sea ice will not recover." That is particularly bad news because it creates a potent feedback effect: instead of blinding white ice that bounces sunlight back into space, there is now open blue water that soaks up the sun's heat, amplifying the melting process.

—In the tundra of Siberia, other researchers report that permafrost has begun to melt rapidly, and, as it does, formerly frozen methane—which, like the more prevalent carbon dioxide, acts as a heat-trapping "greenhouse gas"—is escaping into the atmosphere. In some places last winter, the methane bubbled up so steadily that puddles of standing water couldn't freeze even in the depths of the Russian winter.

—British researchers, examining almost six thousand soil borings across the UK, found another feedback effect. Warmer temperatures (growing seasons now last eleven days longer at that latitude) meant that microbial activity had increased dramatically in the soil. This, in turn, meant that much of the carbon long stored in the soil was now being released into the atmosphere. The quantities were large enough to negate all the work that Britain had done to switch away from coal to reduce carbon in the atmosphere. "All the consequences of global warming will occur more rapidly," said Guy Kirk, chief scientist on the study. "That's the scary thing. The amount of time we have got to do something about it is smaller than we thought."

Years later, as even nimwits like Bush and Cheney can no longer deny that some serious shit is happening, people will look back at 2005 -- at Hurricane Katrina, the storm in an extraordinarily busy season of storms that wiped out a city, the first city of what will prove to be all too many.

But the hurricanes also demonstrated another fact about global warming, this one having nothing to do with chemistry or physics but instead with politics, journalism, and the rituals of science. Climate change somehow seems unable to emerge on the world stage for what it really is: the single biggest challenge facing the planet, the equal in every way to the nuclear threat that transfixed us during the past half-century and a threat we haven't even begun to deal with. The coverage of Katrina's aftermath, for instance, was scathing in depicting the Bush administration's incompetence and cronyism; but the President —and his predecessors—were spared criticism for their far bigger sin of omission, the failure to do anything at all to stanch the flood of carbon that America, above all other nations, pours into the atmosphere and that is the prime cause of the great heating now underway. Though Bush has been egregious in his ignorance about climate change, the failure to do anything about it has been bipartisan; Bill Clinton and Al Gore were grandly rhetorical about the issue, but nonetheless presided over a 13 percent increase in America's carbon emissions.

That lack of preparation and precaution dwarfs even the failure to prepare for the September 11 attacks, and its effects will be with us far longer. It's not, of course, that America could in two decades have prevented global warming. But we could have begun taking the steps to keep it from spinning entirely out of control, steps that grow ever more difficult to take with each passing season.

That, stated so succinctly by Bill McKibben in the current issue of The New York Review of Books, is why global warming is the biggest story.

And the most alarming part of the story is that nobody seems to know it. Yet.

[photo: U.S. Antarctic Program]

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