Move to high elevation and latitudes. Make use of shelter and caves. Make use of cooling technologies. Won't work for the large majority, but humans have survived ice ages and colonized the planet with much more primitive technology. I don't think any climate change scenario on Earth ends our species. Would end civilization as we know it.
But as a species we're too adaptable. Earth would have to turn into Venus, and that's not in the cards. Keep in mind that dinosaurs evolved in a 12°C warmer world. So it's not going to be deadly to all animal life.
But as a species we're too adaptable. Earth would have to turn into Venus, and that's not in the cards. Keep in mind that dinosaurs evolved in a 12°C warmer world. So it's not going to be deadly to all animal life.