Read here. Hysterical global warming alarmists keep claiming that polar sea ice melt is due to increasing human CO2 emissions. This is extreme wishful thinking on their part since recent research finds black soot as being the major factor for polar sea ice loss. h/t: Steve Goddard
"Belching from smokestacks, tailpipes and even forest fires, soot—or black carbon—can quickly sully any snow on which it happens to land.....But on snow—even at concentrations below five parts per billion—such dark carbon triggers melting, and may be responsible for as much as 94 percent of Arctic warming....."A surprisingly large temperature response is caused by a surprisingly small amount of impurities in snow in polar regions."....."When soot is there it heats the snow. It acts like a little toaster oven."....."Black carbon in snow causes about three times the temperature change as carbon dioxide in the atmosphere," Zender says. "The climate is more responsive to this than [to] anything else we know.""