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Will Hurricane Sandy be our wake-up call?

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We’ve had two once-in-a-century storms within a decade. Hurricane Sandy seems likely to become the second-costliest storm in U.S. history, behind Hurricane Katrina. Lower Manhattan is struggling to recover from an unprecedented flood, and the New Jersey coast is smashed beyond recognition.

Will we finally get the message?

How, at this point, can anyone deny the scientific consensus about climate change? The traditional dodge — that no single weather event can definitively be attributed to global warming — doesn’t work anymore. If something looks, walks and quacks like a duck, it’s a duck. Especially if the waterfowl in question is floating through your living room.

For decades, researchers have been telling us that one of the effects of climate change would be to make the weather more volatile and violent. Well, here we are.

And here we will remain, perhaps for the rest of our lives. Since the beginning of the Industrial Revolution, when humans began burning fossil fuels in earnest, the concentration of heat-trapping carbon dioxide in the atmosphere has increased by an incredible 40 percent. We have altered the composition of the air.

Even if we halted all carbon emissions tomorrow, elevated levels of atmospheric carbon dioxide — and their effects on the weather — would persist for 50 to 200 years, according to the Environmental Protection Agency. Of course, we won’t stop spewing carbon into the air tomorrow or anytime soon. The global economy runs on carbon, and changing this reality will take many years and a few technological breakthroughs. Even if the United States joins Europe in taking climate change seriously and trying to do something about it, China is now the world’s largest carbon-emitter — and keeps adding coal-fired power plants at an alarming rate.

I have to believe that eventually we’ll get the carbon situation under control. But emissions will get worse before they get better, so one of the biggest questions facing the next president — and his successors — will be how to adapt to the new climatological and meteorological order.

Some environmentalists are wary of talking about adapting to climate change, fearing that it provides an out for those reluctant to engage with the difficult problem of moving to cleaner energy sources. The truth, though, is that both conversations desperately need to take place.

The economic costs alone are enough to concentrate the mind. Hurricane Katrina did more than $100 billion in damage to New Orleans and the Gulf Coast. The cost of Hurricane Sandy will likely exceed $50 billion.

Those sums are not big enough to have a serious impact on the U.S. economy. But consider that the total insured value of property along the Gulf and Atlantic coasts is nearly $9 trillion, according to a 2008 study by AIR Worldwide, a risk-management consulting firm. Imagine the costs if, a few years from now, the next once-in-a-century superstorm slams into downtown Miami or turns Houston into one gigantic bayou.

The coastlines are the most densely populated parts of the country, with about half of all Americans living within 50 miles of the sea, according to the Census Bureau. About three of every 10 Americans live in coastal counties, including 41 million on the Atlantic Seaboard and 14 million on the fast-growing Gulf Coast — the areas most vulnerable to Katrina-style and Sandy-style storms.

Given sea-level rise, storm surges may reach levels that seemed unimaginable, as happened this week in Lower Manhattan. Cities are going to have to consider building huge — and hugely expensive — surge barriers similar to the ones that protect Rotterdam and London. For New York, this seems a no-brainer. What price is too high to protect one of the great financial and cultural centers of the world?

New York Mayor Michael Bloomberg endorsed President Obama for reelection Thursday, citing his leadership on climate change. Obama recognizes the looming crisis; challenger Mitt Romney once did, but now apparently does not.

Do we need new and more restrictive building codes for vulnerable barrier islands, such as those along the Jersey shore? If so, then surely we must need similar measures farther south, where hurricane impacts are more likely. Or were more likely. I’m not sure we even know what’s likely anymore.

These may be state and local issues, but tackling them will require federal involvement. Hurricane Sandy was ultimately a national disaster, and Washington will foot much of the recovery bill.

Climate change is a national challenge. Ignoring it is not a solution. Pretending it isn’t happening will not make it stop.

eugenerobinson@washpost.com

Read more at PostOpinions: The Post’s View: In the wake of Hurricane Sandy James Downie: “It’s global warming, stupid” Eugene Robinson: Why the chill on climate change? Dana Milbank: A perfect political storm Matt Miller: Sandy’s closing argument

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