We've certainly changed the landscape of the ecosystem. I wish humans would be happier living side-by-side with more types of organisms as opposed to leveling the whole damn environment just so that we can pop out more babies.
Global warming may cause mass extinctions depending on how quickly it occurs and to what magnitude. Evolution may be fast, but it still takes some amount of time. 7 degrees F is the Trump admins estimate and that's pretty damn yuug.