independent review of more than one and a half billion temperature records from fifteen sources over more than a century clearly shows that the planet is warming. Researchers at the University of California, Berkeley have confirmed previous reports that global temperatures have risen by 1 degree Celsius or nearly two degrees Fahrenheit overall.
The team included a 2011 Nobel Prize winner in Physics, Saul Perlmutter and various climatologists and statisticians. Compiling a huge open database of temperature records, researchers found a striking correlation with earlier American and British studies and the data clearly supports the conclusions that warming is occurring.
This study is the most comprehensive and thorough to date and focused on some nagging questions about the debate. According to this statement:
" The most important indicator of global warming, by far, is the land and sea surface temperature record. This has been criticized in several ways, including the choice of stations and the methods for correcting systematic errors. The Berkeley Earth Surface Temperature study sets out to to do a new analysis of the surface temperature record in a rigorous manner that addresses this criticism. We are using over 39,000 unique stations, which is more than five times the 7,280 stations found in the Global Historical Climatology Network Monthly data set (GHCN-M) that has served as the focus of many climate studies."Skeptics have long criticized the use of data sources considered of 'poor' reliability. However, the results remained surprisingly consistent regardless of the perceived accuracy of some reporting stations. Despite local variations, the overall trend remained the same as stations considered 'reliable'.
Researchers found that there is an 'urban heat effect' which is significant to the local area. However, as less than 1% of the global land area is urban, these 'heat islands' were not deemed significant to the planet's overall climate.