katrina-aftermath.jpgG. Gordon Liddy’s daughter repeated a standard Denier line in our debate: Humans are very adaptable — we’ve adapted to climate changes in the past and will do so in the future.

I think Hurricane Katrina gives the lie to that myth. No, I’m not saying humans are not adaptable. Nor am I saying global warming caused Hurricane Katrina, although warming probably did make it more intense. But on the two-year anniversary of Katrina, I’m saying Katrina showed the limitations of adaptation as a response to climate change, for several reasons.

First, the citizens of New Orleans “adapted” to Hurricane Katrina, but I’m certain that every last one of them wishes we had prevented the disaster with stronger levees. The multiple catastrophes — extreme drought, extreme flooding, extreme weather, extreme temperatures — that global warming will bring can be suffered through, but I wouldn’t call it adaptation.

Second, a classic adaptation strategy to deal with rising sea levels is levees. Yet even though we knew that New Orleans would be flooded if the levees were overtopped and breached, even though New Orleans has been sinking for decades, we refused to spend the money to “adapt” New Orleans to the threat. We didn’t make the levees able to withstand a Category 4 or 5 hurricane (Katrina was weaker at landfall than that, but the storm surge was that of a Category 4).

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Third, even now, after witnessing the devastation of the city, we still refuse to spend the money needed to strengthen the levees to withstand a Category 5 hurricane. We refuse to spend money on adaptation to preserve one of our greatest cities, ensuring its destruction, probably sometime this century.

If we won’t adapt to the realities of having one city below sea level in hurricane alley, what are the chances we are going to adapt to the realities of having all our great Gulf and Atlantic Coast cities at risk for the same fate as New Orleans — since sea level from climate change will ultimately put many cities, like Miami, below sea level? And just how do you adapt to sea levels rising 6 to 12 inches a decade for centuries, which well may be our fate by 2100 if we don’t reverse greenhouse-gas emissions trends soon. Climate change driven by human-caused GHGs is already happening much faster than past climate change from natural causes — and it is accelerating.

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The fact is, the Deniers don’t believe climate change is happening, so they don’t believe in spending money on adaptation. The Center for American Progress has written an important paper on hurricane preparedness, which is a good starting point for those who are serious about adaptation.

But don’t be taken in by heartfelt expressions of faith in human adaptability. If Katrina shows us anything, it is that preventing disaster would be considerably less expensive — and more humane — than forcing future generations to adapt to an unending stream of disasters.

This post was created for ClimateProgress.org, a project of the Center for American Progress Action Fund.