He is a prominent critic of scientific studies of temperature records of the past 1000 years that show increasing global temperatures. (vvattsupwiththat.blogspot.ru)
Since 1979, it has been possible to calculate a global temperature record of the atmosphere from satellite observations. (corporateknights.com)
The figure below shows global surface temperatures records from the principal research groups around the world since 1970. (carbonbrief.org)