Andrew H

Humans are a keystone species. They may not have the huge numbers of some other microorganisms they do have far reaching and lasting effects on the environment. Humans have no real predators. Our ability to control our natural world and shape it to our own means with general disregard to the natural environment make us a keystone species. Our effects are also felt all over the world (logging, landfills, atmospheric pollutants, Pacific Ocean Gyre). Our only real enemy is our own success.