Jan. 30  — Elon Musk became the richest man in the world thanks to enthusiasm for Tesla Inc.’s sleek electric cars — and the company’s stratospheric stock price. But while Musk is perhaps the most well known clean energy CEO, SpaceX, his other company, is likely to rely on drilling for natural gas to power Starship, the new spacecraft and rocket designed to carry humans to the moon, Mars and beyond.

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