re: Gliese 710
Red giant expansion is a few billion years away although some climatoligists claim that the sun's warming will be significant enough just 300-400 million or so years from now to raise the Earth's temperature enough for serious mass extinction of all large life forms.
Back to Gliese 710. If there is not a technical civilization on or surrounding Earth 2 million years from now, the resultant comet infall will likely result in impacts, devastating extinction level events.