Reuters: Dwindling numbers of birds worldwide are a sign that governments are failing to keep promises to slow damage to nature by 2010, an international report said on Thursday. Rising human populations and clearance of forests for farming or biofuels were wrecking natural habitats, according to the study by Birdlife International, which groups experts in more than 100 conservation bodies worldwide. Even common birds, such as doves or skylarks in Europe, were becoming scarcer in a …