Galactic Attack

The story has the future of Earth governments gathering together to construct a massive super computer called Con-Human to help with the planet's environment, providing nutrients to the earth and caring for the ecosystem. However, a cloned human is linked with the system and makes Con-Human a sentient being. The system eventually becomes insane and starts to create natural disasters, wiping all nearly all of mankind and destroying the ecosystem, driving the survivors into space to develop colonies on other planets. Con-Human then makes Earth into a giant fortress and is assembling a massive armada to destroy the remaining survivors, but before it can attack, the survivors amass a first strike in order to reclaim the Earth.