The boys and girls at the Berkely Earth Surface Temperature Group have reviewed global surface temperature data and found, in an Internet circulated Op Ed written by Richard Muller their head, that surface temperatures are rising and that CO2 is the most credible explanation.
Our results show that the average temperature of the Earth’s land has risen by two and a half degrees Fahrenheit over the past 250 years, and one and a half degrees Fahrenheit over the most recent 50 years. Moreover, it appears likely that essentially all of this increase is due to the human emission of greenhouse gases.
Importantly they addressed the criticisms raised by climate change ‘skeptics’ about surface temperature data including:
- biases from the urban heat island effect (they duplicated their results using rural data alone),
- data selection (prior studies used 20% of the available temperature stations; they used near 100%),
- poor station quality (separate analysis for good stations and poor ones), and
- biases introduced by human data adjustment (via an automated process).
The team will be making their findings and statistical techniques available next week, which should again address the concern of climate skeptics (this time over transparency). There’s a more in depth piece here on the Reason website.