The Great JT said:
Then you know how we fix it? GET A NEW POWER SOURCE. Wind power, fusion power, mass effect drives, I don't care! Just stop relying on fossil fuels!
You're thinking that the Greenhouse effect alone is causing this? It isn't, it contributes, but it isn't the sole cause. The sun is in a hotter period at the moment, causing temperatures on Earth to go up.
But yes, driving Electricity as a sole power source would be good, especially if combined with Fusion power plants (Not Deuterium-Tritium plants like the test plant at the Max Planck institute, but rather a Protium plant. Tritium is radioactive, which isn't going to inspire much confidence in that kind of reactors. They're also not fit for starships because of this.
On another note, every day the idea that Earth's fucked gets reinforced in my brain. We really should build a bunch of Generation ships and make our way to Gliese 667Cc/f/e (This'd also solve the overpopulation issue, since all three planets are bigger than Earth). Also, putting a heavy greenhouse effect on 667Ce would only benefit us, since temperatures are pretty cold there at the moment (about as cold as on Mars, if no greenhouse effect is present).
Engines for those starships would very much need to be invented, along with a way to "fold" space behind the ship for faster travel times (travel time at light speed is around 22000 years... yes TWENTY-TWO THOUSAND YEARS).
Life support is suprisingly easy: Good Lighting and all of the Earth's Biomes. Because of this, the ships need to be very large, considering that the Life support part would be both Ark and about 2/3rd 3/4th of the ship.
Gravitation is also doable, just by making the ships spin around the axis that they're moving on (Main Engines and associated Tech should be mounted dead center in this case).
Shielding is an issue, as the speed is tremendous (under normal circumstances, no human could actually, much less continuusly, live at that speed) and shouldn't be feelable at all inside the ship. Hard to do, but possible.