When you first glance at the chart from my last blog entry it sure looks like Global Warming is for real, after 1990 the bars never go into the blue zone. But how can this be when 1934 is still the hottest year on record, this chart makes it look like 1998 is the hottest?
temp chart
© unknown

If you look at the charts from Minnesota there is a lot of ups and downs but no clear warming trend.

The thing that these skewed charts never take into account is the collapse of the Soviet Union in 1990. This brought the number of reporting weather stations around the world down from a high of 15,000 in 1970 to 5,000 in 2000. This takes some of the coldest places on the planet out of the equation, like Siberia.