The doctor alerted him to the riskiness of the medicine.

The physicist was aware of the potential danger of nuclear fusion.

It is strange that a cameraman heading for a war-zone should not know about the danger of unexploded shells. The newspaper company is being negligent in its training.

The doctor warned him of the dangers of smoking.

There's also the danger of unexploded bombs, so they reported it to the police and the area was taped off to keep people out.

Are you creating for us a future world where there is a greater danger of skin cancer, weakened bodies, less food and fewer plants and animals?