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Scientists cast doubt over UN climate panel's global warning claim | Scientists have begun casting doubts over the United Nations climate panel's claim that global temperatures are rising relentlessly because of human pollution. In its last assessment, the Intergovernmental Panel on Climate Change
(IPCC) warned that greenhouse gases had already heated the world by 0.7C and that
there could be 5C-6C more warming by 2100, with devastating impacts on humanity
and wildlife. However, some scientists suggest that the world may not be warming
much at all. "The temperature records cannot be relied on as indicators of global
change," The Times quoted John Christy, professor of atmospheric science at the
University of Alabama in Huntsville, as saying. Christy and other researchers
have begun doubting IPCC's claim, as it is based on thousands of weather stations
around the world, which have been used to collect temperature data over the past
150 years. They say these stations have been seriously compromised by factors
such as urbanisation, changes in land use and being moved from site to site. "The
popular data sets show a lot of warming but the apparent temperature rise was
actually caused by local factors affecting the weather stations, such as land
development," Christy said. Ross McKitrick, professor of economics at the University
of Guelph, Canada, has questioned IPCC's methods. "We concluded, with overwhelming
statistical significance, that the IPCC's climate data are contaminated with surface
effects from industrialisation and data quality problems. These add up to a large
warming bias," he said. Such warnings are supported by a study of US weather stations
co-written by Anthony Watts, an American meteorologist and climate change sceptic.
His study is illustrated with photographs of weather stations in locations where
their readings are distorted by heat-generating equipment. |
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