Eugene Robinson

Last year was officially proclaimed the fourth-warmest on record; scientists predict that melting ice in Antarctica and Greenland could not only raise sea levels but further destabilize weather patterns; and progressive members of Congress are proposing a "Green New Deal," the first policy framework ambitious enough to meet the challenge of global warming.

Climate change is the biggest, most important story of our time. Our grandchildren and great-grandchildren will judge us by how well we meet the challenge, and so far we are failing miserably.

Scientists from NASA announced that 2018 was the earth's fourth-warmest year since record-keeping began about 140 years ago. The warmest year of all was 2016, followed in order by 2017 and 2015; the fifth-warmest was 2014. Anyone who is not deliberately being obtuse can see the pattern.

Why is it so hot? Because humankind has increased the concentration of carbon dioxide in the atmosphere by a staggering 40 percent since the Industrial Revolution. There is now more of the heat-trapping gas in the air than at any time in at least the past 800,000 years. Researchers have looked in vain for any "natural" phenomenon or cycle that could explain the carbon buildup and the rapid warming. Yet global carbon emissions are at an all-time high.

Anyone tempted to shrug – or even cheer, given the brutal cold that much of the nation suffered last month – is whistling past the graveyard. Sea-level rise, in part caused by the fact that warmer water takes up more space than cooler water, has already worsened coastal flooding around the world and threatened to erase low-lying islands from the map. Now attention has shifted to the polar regions, where the warming process is proceeding most rapidly and ice is melting at an unprecedented pace.

Hardly a month goes by without some alarming new report about accelerated melting in Antarctica and the various apocalyptic scenarios that might come true. A paper published in the journal Nature suggests that a phenomenon known as "marine ice cliff instability" might not produce as much additional sea level rise as a 2016 paper had predicted. But a second Nature paper warned that melting ice in Antarctica, Greenland and the Himalayas could seriously disrupt weather and temperature patterns worldwide.

That's the true nature of the scientific debate over climate change. It's not about whether global warming is taking place or what's causing it – those questions are settled. The open question is whether the effects of human-induced climate change will be really bad, catastrophically bad or threat-to-civilization bad.

Enter the resolution, introduced by U.S. Rep. Alexandria Ocasio-Cortez, D-N.Y., and U.S. Sen. Ed Markey, D-Mass., calling on Congress to create a Green New Deal.

Speaker of the House Nancy Pelosi has sounded skeptical. "It will be one of several or maybe many suggestions that we receive," she said, according to Politico. "The green dream or whatever they call it, nobody knows what it is, but they're for it, right?"

The point of the resolution is not to propose specific, detailed policy prescriptions. What it does accomplish, though, is lay out the enormous scale of the climate change problem – and, as a commensurate response, call for "a new national, social, industrial and economic mobilization on a scale not seen since World War II and the New Deal."

The resolution's goal is to reduce net U.S. carbon emissions to zero through a "10-year national mobilization." Such a crusade, as envisioned, would create jobs and economic development while at the same time safeguarding the biosphere. Yes, proposals such as "upgrading all existing buildings in the United States" and "spurring massive growth in clean manufacturing" and "overhauling transportation systems" sound like pie in the sky. But that's the scale of the crisis.

Sooner or later, we're going to have to go big on climate change. So let's start thinking big.

Eugene Robinson's email address is eugenerobinson@washpost.com.

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