When conditions on Earth become increasingly difficult to find comfort for survival the result will be extinction no matter how genetic diverse a species might be to facilitate the extremes before it's demise. The 'gene pool' of a species will search without end for adaptation/mutation, but, if the extremes are too extreme the diversity, God given if you like, will fail.

For those thinking they are do for a miracle by their savior long about now, I remind them that they were given a biological place to live and they failed at it.