Global warming risk 'much higher'

By Richard Black
Environment Correspondent, BBC News website

Global temperatures will rise further in the future than previous studies have indicated, according to new research from two scientific teams.

They both used historical records to calculate the likely amplification of warming as higher temperatures induce release of CO2 from ecosystems.

They both conclude that current estimates of warming are too low, by anything up to 75%.

Their conclusion is backed up by a new report from the Australian government.

The Australian Greenhouse Office says current estimates of temperature rise are "being challenged" by new research.