A New Fight Over Pollution Curbs Takes Root

Energy-Intensive Companies Hope to Counter Emissions by Preserving Trees That Might Not Have Been at Risk of Destruction

Jeffrey Ball
WSJ

Truckee, Calif.

How much pollution can a tree absorb? The question is at the center of a high-stakes fight over how much it will cost to curb climate change -- and who will foot the bill.

Trees are nature's antidote to smokestacks and tailpipes. Factories and cars cough out carbon dioxide, a greenhouse gas produced when fossil fuel is burned. Trees inhale it. They store the carbon in their roots, trunks and leaves, and they send the oxygen back into the air.

Forests are becoming more valuable, as governments provide incentives not to cut down woods. The owners of a forest in California are taking inventory of how much carbon dioxide its trees take in, in hopes of selling carbon credits to polluters.

But when a tree is destroyed, its carbon wafts back up into the atmosphere. Globally, according to the United Nations, nearly 20% of man-made greenhouse-gas emissions come from deforestation: trees cut and burned by humans, or mowed down by forest fire, or rotted away by disease. That is more carbon dioxide than comes from all the world's cars, trucks, planes, trains and ships, combined.

Now, some of the world's biggest polluters are turning into tree-huggers. Facing impending government orders to help curb climate change, energy-intensive companies argue that if they help prevent a forest from being destroyed, they will be keeping carbon dioxide out of the air. So they are proposing that they pay forest owners to keep their trees alive, and in exchange they receive carbon credits that reduce their obligation to make costlier emission cuts at their own factories. In short, they want to harness photosynthesis for the benefit of their bottom line.

(More here.)