50 more cold Winter days till Spring arrives on March 20th

Not by pollution per se, but the biggest mass extinction that wiped out over 95% of all life on Earth was due to the planet warming by 10 degrees Celsius caused by CO2 and methane being released. Volcanoes released CO2 which caused a rise in the planet temps which in turn caused methane to be released triggering even higher temps.

Here's an excellent video by Thom Hartmann about it....