Press Trust of India: Residential and commercial buildings across the globe, which account for one-third of greenhouse gas emission, have huge potential to combat climate change, a new United Nations report has said. Dozens of surveys conducted worldwide show that up to 30 per cent reduction in emissions from residential and commercial buildings can be achieved by 2030 at net negative cost, said the recent report of the United Nations Environment Programme (UNEP). The UN Intergovernmental Panel on …