Australian: THERE has been an enormous shift in opinion in recent years about climate change. Scientists and political leaders are now united over the threat and the need for action. But there is a danger of a chasm on the size and speed of the cuts to greenhouse gas emissions we require. Scientists say cuts of between 25 per cent and 40 per cent in industrialised countries by 2020 are essential to hold temperature rises down and lessen the risk of catastrophic, irreversible climate change. …