On a cold hillside at the edge of western Wales' Cambrian Mountains, more than a thousand saplings, all planted in the last couple of months, are taking root. The trees are local beech, ash, oak, alder and willow, among others but the money behind them isn't. Green-minded airline passengers from as far away as the U.S. and New Zealand are stumping up $20 per plant, hoping the trees will absorb from the atmosphere an amount of carbon dioxide (CO2) equivalent to their share spewed out during a flight. To Ru Hartwell, project director of Treeflights.com , which offers...
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