Which of the following claims is a downside to renewable energy sources ? Select all that apply.
a) it is difficult for renewable energy sources to generate power on the same large scale as fossil fuels
b) create major pollution by emitting greenhouse gasses
c) the building of wind farms and hydroelectric dams can disrupt wildfire and migration patterns and lead to ecological destructions
d) there is a limited supply of these types of resources
e) renewable energy prices can be unstable over time