[Actualizado] A BUENAS HORAS, mangas verdes. Varios científicos que participaron en el 4º informe del Panel Internacional sobre el Cambio Climático empiezan a decir ahora que quizás el planeta no se esté calentando, después de todo:

“The temperature records cannot be relied on as indicators of global change,” said John Christy, professor of atmospheric science at the University of Alabama in Huntsville, a former lead author on the IPCC.

The doubts of Christy and a number of other researchers focus on the thousands of weather stations around the world, which have been used to collect temperature data over the past 150 years.

These stations, they believe, have been seriously compromised by factors such as urbanisation, changes in land use and, in many cases, being moved from site to site.

Christy has published research papers looking at these effects in three different regions: east Africa, and the American states of California and Alabama.

“The story is the same for each one,” he said. “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.”
The IPCC faces similar criticisms from Ross McKitrick, professor of economics at the University of Guelph, Canada, who was invited by the panel to review its last report.

The experience turned him into a strong critic and he has since published a research paper questioning its 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.

Toma consenso científico.

ACTUALIZACIÓN. Y miembros del IPCC dicen  que el organismo no es científico sino político. Recordadlo la próxima vez que alguien os diga que "la ciencia está clara, y como prueba lee los informes del IPCC".