scientists : Improved use of renewable energy resources, which is expected to cover 50 per cent of the total global energy consumption by 2050, can save Taka 2000 to 2500 crore annually in Bangladesh, scientists aid. They observed that non-renewable sources of energy, which includes traditional resources, trees, solar, wind, bio-gas and tide can reduce wastage of energy by 50 per cent by only using by locally innovated improved burner.