Worst case study: global temp up 4 degrees Celcius by 2060s
(Planet Ark, 29 Nov 10) World temperatures could soar by 4 degrees Celsius (7.2 degrees Fahrenheit) by the 2060s in the worst case of global climate change and require an annual investment of $270 billion just to contain rising sea levels, studies suggested on Sunday.
Such a rapid rise, within the lifetimes of many young people today, is double the 2 degrees C (3.6 degrees Fahrenheit) ceiling set by 140 governments at a U.N. climate summit in Copenhagen last year and would disrupt food and water supplies in many parts of the globe.
Rising greenhouse gas emissions this decade meant the 2 degree goal was "extremely difficult, arguably impossible, raising the likelihood of global temperature rises of 3 or 4 degrees C within this century," an international team wrote.
The studies, published to coincide with annual U.N. climate talks in Mexico starting on Monday, said few researchers had examined in detail the possible impact of a 4 degrees C rise above pre-industrial levels.
"Across many sectors -- coastal cities, farming, water stress, ecosystems or migration, the impacts will be greater," than at 2 degrees, wrote Mark New of Oxford University in England, who led the international team.
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