Which of the following energy sources is expected to have the least growth in the next 20 years?
a. hydroelectricity
b. coal
c. natural gas
d. nonhydro renewables

Answer;

A. hydroelectricity

Explanation;

A nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption. Most fossil fuels, such as oil, natural gas and coal are considered nonrenewable resources in that their use is not sustainable because their formation takes billions of years.

-Renewable resources are resources which are being continuously consumed by man but are renewed by nature constantly are called as Renewable Resources. These resources are inexhaustible because they cannot be exhausted permanently.  Some examples of renewable energy sources are solar energy, wind energy, hydropower, geothermal energy, and biomass energy.

1/0.14nm = 10^10/1.4 a lot