We have all heard the cries of doom.
The oceans are going to rise and destroy mankind! The animals that we are used to in our local environment are all going to die. The tornados will cause mass destruction. Hurricanes will destroy our coastlines.
These have been going on for a LONG TIME now.
One of the biggest fear mongers was Jim Hansen. In 1988, he was looking out on Broadway in New York City and observing the Hudson River. Here is his prediction as remembered by the reporter beside him: