
Though science cannot yet explain all the reasons behind global warming, "a changing climate is a reality," and one that effects all sectors of society, said Achim Steiner, director of the UN Environment Program.
Steiner cited a worst-case scenario prediction that temperatures will rise 4 degree Celsius by 2060 while the sea level will rise one meter over the next century.
There are myriad threats already and their numbers will rise, he said, noting droughts like the one currently afflicting Somalia, floods such as the ones that hit Pakistan, and their implications on the food markets.
"The scale of the the natural disasters will increase exponentially," he added.
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