So just what does explain Global Warming?

Hang around the debate between proponents and opponents of Anthropogenic Global Warming for a while, and you'll hear this question tossed out to the opponents by the proponents.  OK, smartypants.  If it's not Carbon Dioxide, just what it it?

There's a very interesting post over at Roger Pielke, Sr.'s blog, about precisely this.

Thus the rate of temperature rise during the last 200 years is about +1°C/200 years,  + 0.5°C/100 years, which is about 5/6 of the rate of increase (+0.6°C/100 years) during the last century. Therefore, it may be inferred that the CO2 contribution was about +0.1°C during the last century. There was no obvious break in the rate of temperature rise during the last 150~200 years, so it is likely that the recovery from the LIA is continuing to the present. Sea level rise is approximately linear (1.7mm/year or less) from about 1850, to the present. The retreat of many glaciers in the world began from about 1800-1850, not after 1946, when CO2 began to increase rapidly. When discussing the present warming, we should not ignore the LIA and its recovery.

The only complication is that the multi-decadal oscillation, of the amplitude  ~0.2°C and a period of about 60 years, is superposed on the linear change. It peaked in about 1940 and 2000. After 1940, the temperature change was negative until 1975, so a similar negative trend may continue until about 2030. This may explain the present halting of the temperature rise. The inferred temperature increase by 2100 is about + 0.5°C±0.2°C, depending on the phase of the multi-decadal oscillation.

If climate chage is your bag, baby, RTWT.

Tagged with "junk science" because I don't have a tag for "non-junk science".