【单选题】The world's demand on gas is expected to increase in the future as climate change concerns grow, while renewable energy is still expensive to be developed, a prominent economist said on Friday. 'Deman...
A.
How long shall we wait to use the renewable energy?
B.
Renewable energy is getting cheaper as technology becomes more advanced.
C.
Climate change concerns results in revolution on the use of energy.
D.
Gas demand is to sharply increase as climate change concerns grow.