Global warming is approaching the point of no return, after which widespread drought, crop failure and rising sea levels will be irreversible, an international climate change task force warned Monday. It called on the Group of 8 leading industrial nations to cut carbon emissions, double their research spending on technology and work with India and China to build on the Kyoto Protocol for cuttings emissions of carbon dioxide and other greenhouse gases" blamed for global warming. "An ecological time bomb is ticking away," said Stephen Byers, who was co-chairman of the task force with U.S. Sen. Olympia Snowe, R-Maine. "World leaders need to recognize that climate change is the single most important long-term issue that the planet faces." According to the report, urgent action is needed to stop the global average temperature rising by 2 degrees Celsius (3.6 degrees Fahrenheit) above the level of the year 1750 - the approximate start of the Industrial Revolution, when mankind first started significantly adding carbon dioxide to the atmosphere. No accurate temperature readings were available for 1750, the report said, but since 1860 the global average temperature has risen by 0.8 percent to 15 degrees Celsius (59 degrees Fahrenheit).

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