SHARM EL-SHEIKH, Egypt/TOKYO -- The world's biggest summit on climate change kicked off in Egypt on Sunday, with thousands of delegates from around the globe there to tackle a range of pressing environmental issues following a year of heat waves, droughts, typhoons and flooding.
The event comes as scientists warn that rises in the Earth's temperature must be kept well below 2 degrees Celsius -- and preferably under 1.5 degrees -- compared to the 1800s to avoid life-threatening consequences. But a United Nations report in October said that current efforts would lead to warming of as much as 2.6 degrees by the end of the century.
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