For many years, thousands of scientists and other technical people have stated that humans do not cause global warming. Nature does.
The official record of temperatures in the USA comes from a network of 1,221 climate-monitoring stations overseen by the National Weather Service. Anthony Watts, a 25-year broadcast meteorology veteran, recruited a team of more than 650 volunteers to visually inspect and photograph more than 860 of these stations. They were shocked to find that 89 percent of the stations failed to meet the requirement that stations must be 100 feet or more away from artificial heating, radiating, and reflecting heat sources.
Even worse, they found major gaps in the data record that were filled in with data from nearby sites. Their conclusion was that the U.S. temperature record is unreliable and should not be used to promote unsubstantiated global warming theories. Much more information is available at www.surfacestations.org.