I think he could've said that better. IMO,the point he was trying to make with the Erik the Red stuff is that climate change tends top open doors as much as it closes them. The megafauna that went extinct made room for other species. Warming can be disastrous for some latitudes and a boon for others. He wasn't saying that warming is a wonderful thing-- he was saying that it's more complex than that, and pointing out one example.