Stabilizing greenhouse gas concentrations at 550 ppm -- which would invoke a rise in temperature of about three degrees Celsius -- would require energy emissions to rise no higher than 33 gigatons and would need to fall in the longer term.
On a 4-match running PPM basis Chelsea have now earned an average of 2.0 or more points per match for the last four matches, and now have the highest 4-match PPM after Arsenal had led the three teams for the last month of play.
At that point he began a slow erosion in performance that culminated in a -0.227 PPM by his sacking after match 27 (-8.6 points over 38 matches, or a nearly 16 point swing).
On the opposite end of the spectrum, the Red Devils spent a massive twenty-seven weeks at or above a 2.0 4-match running average PPM and nine weeks and counting at a 3.0 PPM.
Spurs fans may now be dreading another collapse like last season (first graph below) as Tottenham has dropped below a 1.0 4-match running average PPM for only the second time this season (second graph below).
So until recently they hardly ever seriously considered or modeled the do-nothing scenario, which is a tripling (820 ppm) or quadrupling (1100 ppm) of preindustrial levels of carbon dioxide over the next hundred years or so.
City also only hit the 3.0 PPM threshold twice this year, while last year they were able to put together and maintain four-match win streaks nearly four times as frequently.