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TARUNA JAYA, INDONESIA — Across a patch of pineapples shrouded in smoke, Idris Hadrianyani battled a menace that has left his family sleepless and sick — and has wrought as much damage on the planet as has exhaust from all the cars and trucks in the United States. Against the advancing flames, he waved a hose with a handmade nozzle confected from a plastic soda bottle.

Amid often-acrimonious debate over how to curb global warming ahead of a critical U.N. conference next month in Copenhagen, “peat is the big elephant in the room,” said Agus Purnomo, head of Indonesia’s National Council on Climate Change. Dealing with it, he said, requires that the world answer a vexing question: How can protection of the environment be made as economically rewarding as its often lucrative destruction?