Which of the following energy sources is expected to have the highest rate of consumption in 2030? a. coal b. natural gas c. nuclear d. renewable energy (answer is not d)

The answer to this question would be A. Coal
Until 2030, the projected source of energy would be oil, coal, natural gas, renewable, and nuclear. 
Renewable energy cost today is still too high to attract users. The cost starts to be good enough 2030 and its use rate might start to be increased. But it will be influenced much by the government policy. Solar energy will be the most used renewable energy since it can be put anywhere on the planet. Nuclear plant risk is too high and it will be better to focus on renewable energy.