Developing renewable energy resources could account for _____ of world energy production by 2050 or sooner.
a. 20%
b. 30%
c. 40%
d. 50%
e. 60%
Answer: D
Developing renewable energy resources could account for _____ of world energy production by 2050 or sooner.
a. 20%
b. 30%
c. 40%
d. 50%
e. 60%
Answer: D