I know this is off-topic, but please.
Looks at Venus, a flaming hot pile of rock thanks to greenhouse gases
And no, it's not as simple as that. It becomes a positive feedback loop, because the oceans also lock carbon dioxide, as does the rock being exposed from rapidly retreating ice sheets, which is adding to the warming.
And also, you would be surprised how sensitive pretty much every living thing is to temperature. If our internal body temperature rose even 7 degrees celsius (that's like going up 12 farenheit, according to google) we would die. Thankfully we can regulate our body temperature much better than that, but not everything can (coral, for instance, is used to the general stability of ocean temperatures in the regions that it grows).
Please actually research this stuff before you make baseless statements, for everyone's sake.