Seth Borenstein reports that CO2 is rising at an accelerating pace
WASHINGTON – (AP) — The world’s air has reached what scientists call a troubling new milestone for carbon dioxide, the main global warming pollutant.
Monitoring stations across the Arctic this spring are measuring more than 400 parts per million of the heat-trapping gas in the atmosphere. The number isn’t quite a surprise, because it’s been rising at an accelerating pace. Years ago, it passed the 350 ppm mark that many scientists say is the highest safe level for carbon dioxide. It now stands globally at 395.
Last year, Romm reported that CO2 was increasing “super-exponentially.” Yet when discussing Hansen’s 1988 predictions, they claim that Scenario B is closest to actual emissions.
Scenario A assumes continued exponential trace gas growth, scenario B assumes a reduced linear growth of trace gases, and scenario C assumes a rapid curtailment of trace gas emissions such that the net climate forcing ceases to increase after the year 2000.
The term “reduced linear” doesn’t make any sense, but it certainly doesn’t mean “accelerating.” The only scenario which fits the description is scenario A.