Business Green: The world needs a significant investment now to kick-start climate change mitigation, according to a new study from European researchers. However, subsequent investments will have a more pronounced effect. And if we invest 2 per cent of global GDP in averting climate change, we have a 90 per cent chance of keeping global temperatures at 2 per cent above 19th century levels. In a paper published in the Proceedings of the National Academy of Sciences called Near-linear cost increase to …