In 2015, the leaders of 191 countries met in Paris and hammered out a deal to combat climate change. We wonder: How much money would countries worldwide collectively need to invest by 2030 to meet the minimum clean energy targets of the Paris Agreement?
A. One year’s worth of global GDP
B. One year’s worth of U.S. GDP
C. One year’s worth of the GDP of China and India
D. Global annual defense spending
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