Even thought atmospheric carbon dioxide reached almost 400 ppmin May of this year, we see little evidence that it has produced any warming. Although the press has been claiming that global warming is spawning extreme, usual weather, we see little evidence of that also. Anthony Watts of WUWT blog has a review of real data showing the state of the climate (see his post here). Below, I provide some highlights from that post.
The Arctic warmed above freezing later in the year than usual and has dropped (at least temporarily) below freezing earlier. Arctic sea ice extent is higher for August than it has been in the last five years, although it is still below the 1979-2000 mean. See the black line in the graph below:
“Antarctic sea ice extent at the end of July was the highest on record for that day, growing to 18.077 million sq km. The previous record of 17.783 was set in 2010, whilst the 1981-2010 average was 16.869.”
For the year to date (August 9), the number of tornados is the lowest in the last 8 years. See black line at bottom of graph:
Satellite temperature measurements of the lower troposphere show a slightly declining trend since the super El Nino in 1998.
Surface temperatures as recorded by the British HADCRUT database of land and sea surface temperatures show a nearly flat trend since 1998.
The Rutgers University Global Snow Lab shows winter extent of snow cover in the northern hemisphere among the four highest since 1967.
Even though we have had some devastating forest fires this year, the National Interagency Fire Center statistics show that compared to other years, 2013 has had the smallest number of fires and the second smallest number of acres burned to date since 2004.
Even though carbon dioxide has been rising in the atmosphere, we are seeing none of the predicted effects of global warming that it is supposed to produce.