Science: Offsetting with trees only works in tropics

Research by ecologist Govindasamy Bala of Lawrence Livermore National Laboratory has found that planting more trees in high latitudes could be counterproductive from a climate perspective.

This raises concern about many so-called carbon offsetting projects which rely on tree planting. The scientists warn that many schemes designed to offset emissions of carbon by planting trees may not be appropriate. Dr Bala said: "When you plant trees to slow down global warming, you have to be careful where you do it. I think our study shows clearly the climate benefits are maximised if you plant them in the tropics."

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