1. Speed does matter, however high-speed changes in the environment are neither unnatural nor unprecedented. 2. If they are successful as invasive species, the

1. Speed does matter, however high-speed changes in the environment are neither unnatural nor unprecedented. 2. If they are successful as invasive species, then yes most likely that would happen given enough time. Even the most remote islands in the ocean are populated with life forms that are too modern to be explained with plate tectonics. Nature has it's ways (besides evolving humans). 3. As you noticed humans spread all kinds of viruses, insects, blights and other unfortunate beings. Like them or not, they are as valid as a part of the biosphere as the chestnut tree.