Everywhere you look there is evil and crime, wars & hatred, and even regards the state the planet is in, scientists are spelling out the final verdict.
Anyone can make a prophecy that must eventually occur. I hereby prophesy that tomorrow the sun will rise.
Sometimes the Witnesses tout Revelation 11:18 as indicating that only now has mankind had the capacity to actually 'ruin' the Earth. They don't bring up Genesis 6:12 in the same sentence.