Without any scientific evidence, there are different possibilities to that question. First off, Evolution is the process where different living organisms with different genetic composition develop from earlier life forms through out earth's history.
Considering today's environmental changes that are still happening, global warming, chemical and gas emissions, it is safe to say that there's possible of Little gene mutation here and there. But not enough to completely change genetic composition.
If we consider an apocalyptic situation, it could lead to natural selection of the best fitted. That would decrease the available gene pool and perhaps a lot of human gene would be lost. Still not enough to cause a change.
I highly doubt infinity. Reason being that mankind has depleted and is still depleting natural resources for sustenance and longevity. If this trend continues, extinction would be the possible outcome.