I NEED HELP ! 1. what is a major drawback of wind and solar energy?
a. the wind is always blowing with enough force to turn a turbine
b. storing large amounts of electricity is difficult and can be dangerous
c. the sun provides mores energy than we currently need
d. all of the above

2. how could the building of a dam affect the Earth system?
a. a dam could increase the amount of CO2 in the atmosphere
b. a dam could produce waste material that is harmful to living organisms for thousands of years
c. a dam could cause the flooding of a nearby forest
d. all of the above