Why would variations in renewable energy supplies become a problem when renewable energy supplies make up 40% of our total energy use?
A)
Beyond about 40%, the natural variation will cause the technologies to not be cost effective.
B)
Beyond about 40%, the natural variation will produce detrimental changes to the environment.
C)
Beyond about 40%, the natural variation will start to cause diseases that affect both man and other organisms.
D)
Beyond about 40%, the natural variation will cause climate change.
E)
Beyond about 40%, the natural variation will produce shortages in energy supply.