Ironically you are illustrating how much worse it is today because we are adding ON TOP of a natural warming cycle (since the last Ice Age ended). You also fail to mention that atmospheric carbon hasn't been this high in at least a million years. You also don't show how the MODERN biosphere and ecosystem (not the one for cold-blooded creatures and trilobites) is supposed to adapt nearly overnight, instead of over a thousand or more years. It's very silly to invoke past temperatures since the Earth itself was molten for like a billion years. Everything WE care about WE can destroy in short order and no amount of air conditioning will help you when temperatures reach 150° F outside. No crops will be grown. No forests will be unburned and Category 5- 7 Hurricanes will be the norm in such conditions. Uninhabitable. Sound good to you?