The world is getting warmer, countering the doubts of climate change sceptics about the validity of some of the scientific evidence, according to the most comprehensive independent review of historical temperature records to date.
Scientists at the University of California, Berkeley, found several key issues that sceptics claim can skew global warming figures had no meaningful effect.
The Berkeley Earth project compiled more than a billion temperature records dating back to the 1800s from 15 sources around the world and found that the average global land temperature has risen by around 1C since the mid-1950s.
This figure agrees with the estimate arrived at by major groups that maintain official records on the world's climate, including Nasa's Goddard Institute for Space Studies in New York, the US National Oceanic and Atmospheric Administration (Noaa), and the Met Office's Hadley Centre, with the University of East Anglia, in the UK.
"My hope is that this will win over those people who are properly sceptical," Richard Muller, a physicist and head of the project, said.
"Some people lump the properly sceptical in with the deniers and that makes it easy to dismiss them, because the deniers pay no attention to science. But there have been people out there who have raised legitimate issues."
Muller sought to cool the debate over climate change by creating the largest open database of temperature records, with the aim of producing a transparent and independent assessment of global warming.
The initial reluctance of government groups to release all their methods and data, and the fiasco over emails from the University of East Anglia's Climatic Research Unit in 2009, gave the project added impetus.
The team, which includes Saul Perlmutter, joint winner of this year's Nobel Prize in Physics for the discovery that the universe is expanding at an increasing rate, has submitted four papers to the journal Geophysical Research Letters that describe their work to date.
Going public with results before they are peer-reviewed is not standard practice, but Muller said the decision to circulate the papers before publication was part a long-standing academic tradition of sanity-checking results with colleagues.
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Scientists at the University of California, Berkeley, found several key issues that sceptics claim can skew global warming figures had no meaningful effect.
The Berkeley Earth project compiled more than a billion temperature records dating back to the 1800s from 15 sources around the world and found that the average global land temperature has risen by around 1C since the mid-1950s.
This figure agrees with the estimate arrived at by major groups that maintain official records on the world's climate, including Nasa's Goddard Institute for Space Studies in New York, the US National Oceanic and Atmospheric Administration (Noaa), and the Met Office's Hadley Centre, with the University of East Anglia, in the UK.
"My hope is that this will win over those people who are properly sceptical," Richard Muller, a physicist and head of the project, said.
"Some people lump the properly sceptical in with the deniers and that makes it easy to dismiss them, because the deniers pay no attention to science. But there have been people out there who have raised legitimate issues."
Muller sought to cool the debate over climate change by creating the largest open database of temperature records, with the aim of producing a transparent and independent assessment of global warming.
The initial reluctance of government groups to release all their methods and data, and the fiasco over emails from the University of East Anglia's Climatic Research Unit in 2009, gave the project added impetus.
The team, which includes Saul Perlmutter, joint winner of this year's Nobel Prize in Physics for the discovery that the universe is expanding at an increasing rate, has submitted four papers to the journal Geophysical Research Letters that describe their work to date.
Going public with results before they are peer-reviewed is not standard practice, but Muller said the decision to circulate the papers before publication was part a long-standing academic tradition of sanity-checking results with colleagues.
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