Musk announced the news on Twitter and invited people to participate in the program, writing: "SpaceX is starting a program to take CO2 out of atmosphere & turn it into rocket fuel. Please join if interested."
Earlier this week, Musk asked his Twitter followers to vote to determine the future of his Tesla holdings, but filings reveal the sale was already scheduled.
Elon Musk issued a warning on Thursday against Democrats' billionaire tax proposal, saying that eventually the government will run out of ultra-wealthy individuals, following which, they will target the majority middle class.