In Bali, climate scientists urge tough emissions limits

More than 200 scientists signed a petition predicting dire consequences if greenhouse gases are not cut in half by 2050.

Some 212 of the world's leading climate scientists signed a petition calling for representatives attending the UN climate talks in Bali to make dramatic cuts in carbon dioxide and other greenhouse gasses. The Bali Climate Declaration, released Thursday, calls for global greenhouse gas emissions to be cut in half by 2050. Such a reduction, the scientists say would give humans an "even-money chance" of avoiding catastrophic climate change, a spokesman for the signatories said.

Reporting from Bali, Indonesia, reporter Peter N. Spotts discusses the resolution.

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