ancient Greenland

I read an article about greeenland wasn't covered with ice but grasses about a half million years ago. Some researcher discovered ancient insect's and plant's DNA from threre. Now global warming is proceeding in the world. So I think we will be able to see really green Greenland someday. Not only Greenland but also other land covered with ice would be seen in the future because of the global warming. And the reverse pattern would be done, too. So I think the looks of future Earth would be canged. Human could live on that Earth?? I think many people would die because they could not adapt the change of the Earth. We must resolve environment problem soon. So you must do something which you can help Earth.