4. Which of these are environmental costs of using
nuclear energy? Select all correct answers.
[] a. A significant amount of carbon emissions is
given off.
b. The waste generated is hazardous and must
be disposed of.
c. Nuclear material can be spilled into the ocean
if reactors are near the coast.
[d. A large amount of cold water is generated,
which must be stored somewhere.

b. The waste generated is hazardous and must  be disposed of.

c. Nuclear material can be spilled into the ocean  if reactors are near the coast.

d. A large amount of cold water is generated,  which must be stored somewhere.​

Explanation:

The main environmental costs for produced during the nuclear power plant consists of procurement of fuel and the thermal load is also produced with cold water discharge in the sea. This can contaminate the sea, hence, must be stored somewhere. The nuclear waste consists of radioactive substances which are hazardous for the environment. The nuclear based electricity does not produce carbon dioxide.