Economists say countries should ramp up the price of carbon emissions to as much as USD 100 per metric ton by 2030 to stop catastrophic global warming. Experts including Nobel Laureate Joseph Stiglitz and former World Bank chief economist Nicholas Stern say carbon dioxide should be taxed at USD 40-USD 80 per ton by 2020. They say prices should rise to $50-$100 by 2030 to give businesses and governments an incentive to lower emissions even when fossil fuels are cheap. In a report published today, they suggest poor countries could aim for a lower tax since their economies are more vulnerable. You might also want to see this: The Trump administration has rejected calls to introduce a carbon tax in the United States, saying it would cost jobs. European Union carbon prices stand at just under USD 6 per ton.