It will be exceedingly difficult to limit global warming by decreasing the production of carbon dioxide. We depend on fossil fuel to power the world economy. The world energy demand is projected to increase ________ times between now and 2025, with carbon dioxide emissions _______% higher than today.
a) 2, 30
b) 2.5, 40
c) 3, 50
d) 3.5, 65
Answer: D