Bill McKibben writes:

Though it was published at the beginning of October, Global Warming of 1.5°C, a report by the Intergovernmental Panel on Climate Change (IPCC), is a document with its origins in another era, one not so distant from ours but politically an age apart. To read it makes you weep not just for our future but for our present.

The report was prepared at the request of the United Nations Framework Convention on Climate Change at the end of the Paris climate talks in December 2015. The agreement reached in Paris pledged the signatories to

holding the increase in the global average temperature to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C above pre-industrial levels, recognizing that this would significantly reduce the risks and impacts of climate change.

The mention of 1.5 degrees Celsius was unexpected; that number had first surfaced six years earlier at the unsuccessful Copenhagen climate talks, when representatives of low-lying island and coastal nations began using the slogan “1.5 to Stay Alive,” arguing that the long-standing red line of a two-degree increase in temperature likely doomed them to disappear under rising seas. Other highly vulnerable nations made the same case about droughts and floods and storms, because it was becoming clear that scientists had been underestimating how broad and deadly the effects of climate change would be. (So far we’ve raised the global average temperature just one degree, which has already brought about changes now readily observable.)

The pledges made by nations at the Paris conference were not enough to meet even the two-degree target. If every nation fulfills those pledges, the global temperature will still rise by about 3.5 degrees Celsius, which everyone acknowledged goes far beyond any definition of safety. But the hope was that the focus and goodwill resulting from the Paris agreement would help get the transition to alternative energy sources underway, and that once nations began installing solar panels and wind turbines they’d find it easier and cheaper than they had expected. They could then make stronger pledges as the process continued. “Impossible isn’t a fact; it’s an attitude,” said Christiana Figueres, the Costa Rican diplomat who deserves much of the credit for putting together the agreement. “Ideally,” said Philip A. Wallach, a Brookings Institution fellow, the Paris agreement would create “a virtuous cycle of ambitious commitments, honestly reported progress to match, and further commitments following on those successes.”

To some extent this is precisely what has happened. The engineers have continued to make remarkable advances, and the price of a kilowatt generated by the sun or wind has continued to plunge—so much so that these are now the cheapest sources of power across much of the globe. Battery storage technology has progressed too; the fact that the sun goes down at night is no longer the obstacle to solar power many once presumed. And so vast quantities of renewable technology have been deployed, most notably in China and India. Representatives of cities and states from around the world gathered in San Francisco in September for a miniature version of the Paris summit and made their own pledges: California, the planet’s fifth-largest economy, promised to be carbon-neutral by 2045. Electric cars are now being produced in significant numbers, and the Chinese have deployed a vast fleet of electric buses.

But those are bright spots against a very dark background. In retrospect, Paris in December 2015 may represent a high-water mark for the idea of an interconnected human civilization. Within nine weeks of the conference Donald Trump had won his first primary; within seven months the UK had voted for Brexit, both weakening and distracting the EU, which has been the most consistent global champion of climate action. Since then the US, the largest carbon emitter since the start of the Industrial Revolution, has withdrawn from the Paris agreement, and the president’s cabinet members are busy trying to revive the coal industry and eliminate effective oversight and regulation of the oil and gas business. [Continue reading…]