Which of the following are reasons for why many environmentalists do not see nuclear energy as a clean alternative energy source (select all that apply, there are one to four possible correct answers)?
a. Uranium mining and extraction, processes necessary for fueling nuclear energy reactors, leave behind contaminated groundwater
b. Twenty percent of the energy in the U.S. is supplied by nuclear energy
c. Nuclear energy generation produces radioactive waste
d. Indigenous communities have suffered disproportionately as uranium mining and extraction has historically been done on indigenous lands