The mercury doesn’t lie: We’ve hit a troubling climate change milestone

By Bill McKibben
5 March 2016 (Boston Globe) – Thursday, while the nation debated the relative size of Republican genitalia, something truly awful happened. Across the northern hemisphere, the temperature, if only for a few hours, apparently crossed a line: it was more than two degrees Celsius above “normal” for the first time in recorded history and likely for the first time in the course of human civilization. That’s important because the governments of the world have set two degrees Celsius as the must-not-cross red line that, theoretically, we’re doing all we can to avoid. And it’s important because most of the hemisphere has not really had a winter. They’ve been trucking snow into Anchorage for the start of the Iditarod; Arctic sea ice is at record low levels for the date; in New England doctors are already talking about the start of “allergy season.” This bizarre glimpse of the future is only temporary. It will be years, one hopes, before we’re past the two degrees mark on a regular basis. But the future is clearly coming much faster than science had expected. February, taken as a whole, crushed all the old monthly temperature records, which had been set in … January. January crushed all the old monthly temperature records, which had been set in … December. In part this reflects the ongoing El Nino phenomenon — these sporadic events always push up the planet’s temperature. But since that El Nino heat is layered on top of the ever-increasing global warming, the spikes keep getting higher. This time around the overturning waters of the Pacific are releasing huge quantities of heat stored there during the last couple of decades of global warming. And as that heat pours out into the atmosphere, the consequences are overwhelming. In the South Pacific, for instance, the highest wind speeds ever measured came last month when Tropical Cyclone Winston crashed into Fiji. Entire villages were flattened. In financial terms, the storm wiped out ten percent of the nation’s gross domestic product, roughly equivalent to fifteen simultaneous Hurricane Katrina’s. This was followed by a few months of the highest wind speeds ever recorded in our hemisphere, when Patricia crashed into the Pacific coast of Mexico. And it joins all the other lines of misery: the zika virus spreading on the wings of mosquitoes up and down the Americas; the refugees streaming out of Syria where, as studies now make clear, the deepest drought ever measured helped throw the nation into chaos. The messages are clear. First, global warming is not a future threat — it’s the present reality, a menace not to our grandchildren but to our present civilizations. In a rational world, this is what every presidential debate would focus on. [more]