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SimEarth: Terraforming Mars by the Numbers
An anonymous reader writes "Today NASA has an online terraforming simulation based on the McKay/Zubrin/Fogg model of Mars' weather modification. The simulation shows that the greening of Mars can be done in at least three ways: 1) mirrors melting stored carbon dioxide in tropical soil and polar dry ice; 2) a fluorocarbon (CFC) factory; 3) blowing a vent thruster in the side of a methane-rich asteroid and engineering a collision (perhaps many impacts, but a mere 0.3 km/s impulse drive if using an outer solar system asteroid, such as Chiron, beyond Saturn). Irrespective of the merits or wisdom of these huge engineering projects, their simulation allows moving back the clock to a previous time when Mars was blanketed by greenhouse gases, and thus much warmer."
Erm, there is no such thing as abandonware... All PC game copyrights will expire long after we're all dead and buried unless someone in the government decides to shorten them or the original author forfeits them.
Downloading old games is as illegal as downloading newer ones. Even if no one is selling them. Even if the company is long gone and all programmers died. It's still copyright infringement because it's still copyrighted, what with the insane length copyrights have these days...