- SpaceX: How Elon Musk wants to reach zero-carbon rocket flights. Going zero-carbon for spaceflight could be one of the key breakthroughs that enables SpaceX to achieve its ambitious goal of a city on Mars by 2050. https://www.inverse.com/article/59489-spacex-how-elon-musk-wants-to-reach-zero-carbon-rocket-flights 15 comments space