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The world on Tuesday marks a quarter century since the world's worst nuclear disaster at Chernobyl in Ukraine, haunted by fears over the safety of atomic energy after the Japan earthquake

"As UN negotiators roll up their sleeves for the last push towards a universal climate deal, many fear their end-goal of halting global warming at two degrees Celsius is moving out of reach."

European leaders resolved Friday to revisit safety at nuclear reactors as emergency workers in Japan suffered radiation burns and rising global fears of food contamination hit home.

Carbon emissions are at their highest ever levels, stoking fears of a global temperature rise over the "dangerous" two degrees Celsius threshold, according to data cited by the Guardian newspaper.

The world next week remembers 25 years since the worst nuclear accident in history at Chernobyl, haunted by fears that the Japan earthquake has shown again the risk of atomic power sparking apocalypse.

A global scare sparked by Japan's stumbling efforts to contain a nuclear crisis is encouraging promoters of renewable energy, but defenders of atomic power insist it has a long-term future