D. Uranium is not a renewable source of energy. It cannot be reused/regenerated once it is used.
Coal produces air pollution is my answer
The world is running on non-renewable energy. This has been the source of our power for centuries. However, these resources are declining and it is not long before these sources will finish. This is why we have to shift to the renewable energy sources before it is too late. Clearly, there are a number of advantages of renewable energy sources.
However, there is one disadvantage as well. The disadvantage is that renewable energy sources are very expensive. It takes a lot of effort and time to harvest these sources which explains the high cost. However, it is an inevitable change we all need to make.