Climate change could cost India 2.8 per cent of GDP, and depress living standards of nearly half of its population by 2050, as average annual temperatures are expected to rise by 1-2 per cent over three decades, a World Bank report said. If no measures are taken, average temperatures in India are predicted to increase by 1.5-3 degrees, said the World Bank report titled 'South Asia's Hotspots: The Impact of Temperature and Precipitation Changes on Living Standards'.