But even after Warren's superb finish drew him level on 10 under par, Karlsson birdied the 16th after finding a path through the trees following a poor drive.

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The point of the project, which should be completed by 2014, is to allow Nepal to participate in international carbon-trading schemes that pay poor countries with lots of trees not to cut them down.

ECONOMIST: Forest conservation

Civil society groups led by stellar activists have saved lakes and trees and fought for the poor and dispossessed.

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The pressure of a desperately poor and growing population has led to the indiscriminate felling of trees, for fuel as well as to increase cultivable acreage.

ECONOMIST: From the archive

Agricultural experts have suggested that fruit trees replace grain on the terraced Himalayan hillsides, but it is far from obvious that fruit would yield poor farmers a better return.

ECONOMIST: From the archive