Answer:
Nuclear energy does not represent a significant enviromental hazard as long as the proper safety measures are taken, including the disposal of radioactive waste.
Nuclear energy can be a source of virtually unlimited energy for the world, and it is the most effective alternative to fossil fuels.
Many scientists and economists recognize that without nuclear energy, phasing out of fossil fuels by the mid-century will be almost impossible, and if humanity continues burning fossil fuels, climate change can become a lot more threatening.