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The U.N.'s dire climate report confirms: We're out of time

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We’re out of time. It’s as simple as that.

If the world immediately takes bold, coordinated action to curb climate change, we face a future of punishing heat waves, deadly wildfires and devastating floods — and that’s the optimistic scenario, according to an alarming new U.N. report. If, on the other hand, we continue down the road of half-measures and denial that we’ve been stuck on since scientists first raised the alarm, the hellscape we leave to our grandchildren will be unrecognizable.

Almost 30 years ago, I covered the first “Earth Summit” of world leaders in Rio de Janeiro, at which the U.N.-sponsored Intergovernmental Panel on Climate Change issued its initial assessment of what our spewing of carbon dioxide and other greenhouse gases into the atmosphere was doing to the planet.

That 1992 document is modest about what researchers, at the time, could not be sure of. They admitted there was a chance they might be seeing “natural climate variability.” They thought “episodes of high temperatures” would become more frequent, but they couldn’t be sure. The “unequivocal detection of the enhanced greenhouse effect” was still in the future.

The IPCC’s Sixth Assessment Report, released Monday, makes clear there is no longer any reason to use such guarded language — and no longer any fig leaf of scientific uncertainty to shield governments or individuals who would continue to temporize.

“It is unequivocal that human influence has warmed the atmosphere, ocean and land,” the report says in its summary for policymakers. “Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred ... Human-induced climate change is already affecting many weather and climate extremes in every region across the globe.” There is now strong evidence of “observed changes in extremes such as heat waves, heavy precipitation, droughts, and tropical cyclones, and, in particular, their attribution to human influence.”

As if you didn’t already know that.

The second-biggest wildfire in California’s recorded history is now burning out of control, having destroyed the Gold Rush town of Greenville, the latest in a string of fires in the state. An apocalyptic fire season is plaguing not just western North America but southern Europe as well, including blazes that are devastating Greece’s second-largest island. Earlier this summer, an unprecedented “heat dome” set astonishing new temperature records in the Pacific Northwest and western Canada, including an all-time high for anywhere in Canada: 121 degrees in Lytton, British Columbia, a town that was mostly destroyed the following day by wildfire.

Last month, an almost biblical deluge caused flooding in Germany and Belgium that swept away picturesque towns and killed more than 200 people. Coastal megacities such as Lagos, Nigeria, are struggling to cope with frequent and widespread flooding — caused by an average rise in sea levels, according to the new IPCC report, of nearly 8 inches since the beginning of the 20th century. Oceans are rising because glaciers and ice sheets are melting and because warmer water occupies more volume than cooler water.

All of this is the result of about 2 degrees Fahrenheit of global warming — caused by human activity that has boosted the concentration of carbon dioxide in the atmosphere by 47% and vastly increased the concentration of methane, an even more powerful greenhouse gas. And we are stuck with the consequences of our irresponsibility: “Global surface temperature will continue to increase until at least the mid-century under all emissions scenarios considered,” the IPCC says.

So we have no choice but to adapt to the warmer world we have created and now must live in. We don’t know what caused the shocking and deadly Surfside, Florida, condominium collapse, for example, but we would be foolish not to reexamine oceanside building codes to account for rising seas. We would be foolish not to revise our methods of forest management to cope with extreme heat, drought and fire.

An even bigger challenge is finding ways for billions of people in the developing world to attain middle-class living standards via sustainable energy sources rather than the burning of fossil fuels. China is by far the world’s biggest emitter of carbon dioxide; India’s emissions are rising fast. People in the Philippines, Indonesia, Pakistan, Nigeria and Ethiopia want lives of comfort and plenty, just like ours.

That is why massive investment in new technologies, such as solar power and energy storage, has to be such an urgent priority. At the rate we’re going, the world could warm by nearly 8 degrees Fahrenheit — by the end of this century, according to the IPCC. Relatively few of us who are alive today would still be around to witness what we have wrought. But we know we need to change our ways. Our descendants will curse our memory if we fail to act.

Distributed by The Washington Post Writer's Group.


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