Tesla and SpaceX CEO Elon Musk doesn't shy away from a crisis.

The billionaire has offered his help on everything from supplying power to Puerto Rico following Hurricane Maria to creating materials for affordable housing.

He's also trying to solve more existential problems like climate change and colonizing outer space.

Now, he's working on making ventilator parts and is delivering shipments of medical devices as the US and countries abroad face shortage due to the coronavirus outbreak.

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Elon Musk has courted controversy and made headlines for all the wrong reasons in the past, but he's also had some remarkable success in developing world-changing technology.

For all his bluster, attacks on journalists, and odd behavior, he is also working to solve some of humanity's most dire problems. Climate change? Musk's electric car company, Tesla, has made electric cars exciting. Traffic woes and all the negative health effects of congestion-caused pollution? Musk created The Boring Company to dig a network of tunnels below Los Angeles to avoid gridlocked freeways. Colonizing other planets to save ourselves from extinction? SpaceX is working on it.

Beyond these moonshot initiatives, Musk has delivered real results. After Hurricane Maria knocked out power for millions of Puerto Rico's residents in 2017, Musk donated hundreds of solar-powered batteries to the island. And as the coronavirus spreads worldwide, Tesla has begun working on ventilator parts and shipping medical devices to hospitals in need.

Below, we check in on a few of humanity's problems Musk said he wants to solve. Here's where he's at — and whether or not he's actually helping.

Peter Kotecki contributed to an earlier version of this story.