Berkeley Earth also has carefully studied issues raised by skeptics, such as possible biases from urban heating, data selection, poor station quality, and data adjustment. We have demonstrated that these do not unduly bias the results.
Many of the changes in land-surface temperature can be explained by a combination of volcanoes and a proxy for human greenhouse gas emissions. Solar variation does not seem to impact the temperature trend.
Click here to see the historic temperature record with named volcanos.
After accounting for volcanic and human effects, the residual variability in land-surface temperature is observed to closely mirror (and for slower changes slightly lead) variations in the Gulf Stream.
Berkeley Earth video representation of the land surface temperature anomaly, 1800 to the present.
Berkeley Earth has published five scientific papers setting out the main conclusions of the study to date:
The Berkeley Earth team is making these preliminary results public, together with the analysis programs and data set in order to invite additional scrutiny as part of the peer review process.
You can also look up the temperature record by location (city, country, etc.).