A government scientist has warned that climate change, and specifically the rising levels of greenhouse gases in the atmosphere, is pushing up toxins and lowering nutrients in eucalyptus leaves. Dr Dan Lunney, of the New South Wales Department of Environment and Climate Change, said the trend would force koalas out of trees and on to the ground to search for food, putting them in danger. "What currently may be good koala habitats will become very marginal habitats," he said. "This means koalas have to change trees more often to get to the leaves they need. "As koalas change trees they...