Since, according to The Economist magazine, 90 percent of the world relies on carbon - based fuel for energy, to move away from using it would bring big changes; and the cost of change is fiercely debated.
लेकिन वे इस पर भी एक नज़र रखते हैं कि बदलाव का अर्थव्यवस्था पर क्या असर होगा ।