Reuters: Crop-damaging pests are moving towards the poles at a rate of more than 25 km (16 miles) a decade, aided by global warming and human transport, posing a potential threat to world food security, a study showed on Sunday. The spread of beetles, moths, bacteria, worms, funghi and other pests in a warming world may be quicker than for many types of wild animals and plants, perhaps because people are accidentally moving them with harvests, it said. Scientists based in Britain studied more than 600 types...