Monsanto

I would have to reread the JLA story to get all the details, but - memory may suffise.

Superman and Green Lantern were surprised to find Monsan a lifeless world of ash and poison gas, They found ONE survivor who told them what happened -and then died. How he managed to survive until somebody came to listen to his warning, is not explained.

Green Lantern wanted to atomize the planet, but Superman said "No !" He wanted Monsan to stand as a warning about runaway industrial exploitation. The important thing was to stop Chokh and his crew,