With Deaths of Forests, a Loss of Key Climate Protectors

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But the small trees and brush that would be removed have a low commercial value, especially in a weak economy. With little money available to subsidize the thinning, the Forest Service is reduced to treating only small sections of forest that pose the biggest threat to life and property.

On an even larger scale, experts cite a lack of money as endangering aprogram to slow or halt the destruction of tropical forests at human hands.

Deforestation, usually to make way for agriculture, has been under way for decades, with Brazil and Indonesia being hotspots. The burning of tropical forests not only ends their ability to absorb carbon, it also produces an immediate flow of carbon back to the atmosphere, making it one of the leading sources of greenhouse gas emissions.

Rich countries agreed in principle in recent years to pay poorer countries large amounts of money if they would protect their forests.

The wealthy countries have pledged nearly $5 billion, enough to get the program started, but far more money was eventually supposed to become available. The idea was that the rich countries would create ways to charge their companies for emissions of carbon dioxide, and some of this money would flow abroad for forest preservation.

Climate legislation stalled in the United States amid opposition from lawmakers worried about the economic effects, and some European countries have also balked at sending money abroad. That means it is not clear the forest program will ever get rolling in a substantial way.

“Like any other scheme to improve the human condition, it’s quite precarious because it is so grand in its ambitions,” said William Boyd, a University of Colorado law professor working to salvage the plan.

The best hope for the program now is that California, which is intent on battling global warming, will allow industries to comply with its rules partly by financing efforts to slow tropical deforestation. The idea is that other states or countries would eventually follow suit.

Yet, scientists emphasize that in the end, programs meant to conserve forests — or to render them more fire-resistant, as in the Western United States, or to plant new ones, as in China — are only partial measures. To ensure that forests are preserved for future generations, they say, society needs to limit the fossil-fuel burning that is altering the climate of the world.