The Phoenix Project: To Save Humanity They May Have to Destroy It — Andy Anderson

It's July 23rd 2198 and another day in a climate-controlled paradise. That is until a group of religious terrorists commandeer the orbital station controlling the Earth's fragile weather patterns and plunge the planet into a global ice age. Eight years later the survivors are divided into isolated military camps, constantly battling the fanatics that brought on the disaster. Earth's only hope is a group of renegade scientists. But can they restore the planet's eco-systems before a hostile military, the religious fanatics that started the disaster, or their own internal problems destroy them...