Question

improvements in which area would help reduce the possibility of damage to the environment when using uranium as a fuel?
more - efficient extraction techniques
better control of fusion reactions
stronger - pumping wells
thicker shielding around the reactor

Explanation:

• More - efficient extraction techniques mainly focus on resource - getting process and may not directly reduce environmental damage from uranium use.
• Uranium is used in fission, not fusion reactions, so better control of fusion reactions is not relevant.
• Stronger - pumping wells are related to fluid extraction and not to reducing environmental damage from uranium as a fuel.
• Thicker shielding around the reactor can reduce radiation leakage, thus reducing the possibility of environmental damage when using uranium as a fuel.

Answer:

thicker shielding around the reactor