There would still be earthquakes, droughts, tsunamis, devastating fires, floods, etc in which millions of creatures die. The natural world is one filled with energy, turmoil, destruction and from it, rebirth.
man's buildings and other infrastructure would disappear in a few centuries perhaps, but that would not make one whit of difference to the earth, just as a great city built on a fault line cannot keep an earthquake from occuring.
How can you post this stuff without thinking it though?