BANGKOK (AP) - A U.N. climate conference in Bangkok is hearing from leaders of major religions who say reversing global warming is a moral obligation.

The leaders are urging political leaders, businessmen and individuals to renounce short-term gains and greed to help reach the goal.

Meanwhile, the U.N. Food and Agriculture Organization warned that climate change could cut food production 21 percent by 2050 in poor countries. The Asian Development Bank predicts that global warming could lead to a surge of migration into the region's already crowded cities.

Religious leaders chastised governments for placing national advantage ahead of preserving the human species and negotiators for lacking a sense of urgency.

Negotiators are working on a treaty to replace the Kyoto Protocol that expires in 2012, but a deal is far from certain.

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AP-NY-09-30-09 0827EDT