Sorry I can't recall the papers, but there is quite a bit of evidence that pollution was suppressing temperatures in Europe during that period and that some of the warming after that time was due to laws that limited pollution. Of course China has way worse pollution today than the U.S or Europe ever had. Hmmm.ENIAC wrote:I've often wondered if the period prior to 1980 (after which global temperatures began accelerating) was more stable due to suspended particulates in the atmosphere. See chart below. Recall how filthy the air appeared in many large cities back then. In Denver we had the "Brown Cloud". In Colorado they found that if the sand they used on the roads in the winter was quickly swept up suspended particulates were significantly reduce. But of course reduced suspended particulates will result in additional solar energy reaching the earths surface.
We investigated annual mean DTR for the period 1950 until 2005 for 23 different countries and regions in and around Eu- rope as well as Europe as a whole. A total of 16 out of these 23 regions as well as the European mean show a statistically significant period of decrease and a subsequent increase in DTR. Two additional regions (BeNeLux, Spain) show an in- crease, which however is not statistically significant in the multiple regression analysis. Of the remaining five regions, two (East Germany, Portugal) show no specific trend and three (Sweden, Baltic States, Ukraine) regions show a con- tinuation of the decreasing trend. The trend analysis is lim- ited by the lack of a standard homogeneity procedure and by the limited number of available measurement sites and their spatial distribution.
The connection between DTR, shortwave radiation and SO2 emissions has been qualitatively discussed with respect to a common trend reversal. The period of reversal of DTR from decrease to increase is in most cases in line with social and economic development as indicated by SO2-emissions or deposition, respectively. All reversals of DTR were shown to take place between 1965 and 1990. This is consistent with the change from decrease to increase of incoming short- wave radiation (“Global Dimming” to “Global Brighten- ing”). Consequently, we conclude that the long-term trends in DTR are strongly affected by changes in incoming short- wave radiation, presumably largely influenced by direct and indirect effects of aerosol from sulphurous emissions.
RegGuheert wrote:Of course those aren't the measured global temperatures. As we all know, this data has been tampered with to get a desired result. This tampering has been done worldwide, but we know how much was done here in the U.S.:
Look at that! Temperatures are cyclical.
Fortunately, not all historical records have been tampered with. We know that ice extent today is virtually the same as it was in the 1920s,1930s and 1940s. You can read the same alarming newspaper articles about ice loss from all around the world from the 1920s, 1930s and 1940s. Of course it was nonsense then, just as it is nonsense now.
What we find is that the climate did virtually the same thing in the first half of the 20th century as it is doing now. But we have scientists putting their thumbs on the scales to try to frighten people. It's unfortunate that so many believe the nonsense.
Fortunately, global trends of tornadoes, hurricanes, floods and drought are all down and global tends of food production are up. And it seems heat waves are a thing of the past in the U.S., as well:
Well said. You are not alone: Taking action on climate change was dead last on the UN's survey of the priorities of people all around the world. That tells you a lot about leaders who claim that it is the world's most pressing problem.GetOffYourGas wrote:I like the new title, Reg. It's too bad it didn't stick.
I have nothing to add to this discussion, as I am not a climate scientist, nor am I particularly "alarmed" by current trends. From what I can tell, there are far more pressing issues facing this world. Environmentally, many of them involve much more acute pollution (smog, poisoning water supplies, etc), which are much more of a driver for my behavior that CO2. For those who are concerned about CO2, I guess they can rest assured that your solar array and mine, as well as our EVs, are making a dent in CO2 emissions too, regardless of what we think.
lorenfb wrote:GRA wrote:The weird part as far as Norcal is that we had snow in the Lake Tahoe area just last Sunday, as well as high winds, some light rain, thunder and lightning, hail, a funnel cloud and below average temps in the Bay Area and Sacramento. While not unheard of, snow in June is extremely rare - even May is somewhat uncommon. Temps have been climbing steadily since then, and were in the normal range the past couple of days, but are forecast to break records in many places for the next week or so, with pretty much the entire Central Valley in triple digits a little early in the season.