Global Warming = Earth Evolution
The Earth get's really hot and then it goes really cold, then i get's really hot and then it get's really cold.
There is nothing we can do to stop it.
It's common knowledge that the Earth is in the 'Green Zone' in the our Solar System which is why we have life and other planets here don't. We are just far enough from the Sun to not be too hot or far away enough to be really cold BUT as everyone should know the planets are slowly getting closer (though this is happening VERY VERY VERY slowly). So we are getting closer to the sun which is why it will get hotter and hotter but it won't happen for millions of years.
This is an amazingly simplified approach, where it's not downright wrong.
the 'Green Zone' to which you refer is specific to life as we know it. It allows for free & controlled gas exchange, enzymatic reactions, uninhibited replication - but only because these processes are suited to the envoronment, not because the environment suits the processes. You must have heard about Enceladus recently? Tiny little moon of Saturn, about 500km across, probable water presence? If the top-rated xenobiologists are excited about the possibility of life there, do you think you might be able to send them an email, draw your infallible logic to their attention and warn them to give uf the search now & save face?
You don't really have to look very far to know that the whole 'green belt' concept is pretty crap. What about those geothermal vents discovered, what was it, about 1998? Teeming with sulphur-fixing bacteria, even more complex life such as tubeworms & shrimp feeding off it, all in a rather toxic environment, an entire ecosystem deriving none of its energy from the sun - you might remember them from Planet Earth. Extremophile bacteria live in the most inhospitable environments - extremes of temperature, pH, aridity - and they thrive there, which is surprising only until you realise that their environments are only inhospitable by our standards.
The point being, nobody know to what extent life can survive, under what conditions. That was a lot to say just to disparage the 'Green Belt' hypothesis, but ignorance should never be left to fester. I am a healer.
As far as the planets spiralling toward the sun goes, I doubt ol' Sol is gonna last long enough for that to give us a hotter summer.