Some really smart people are taking a keen interest in clean energy. This is what investors should do now.

Bill Gates made headlines in September when he characterized tree planting as an idiotic response to climate change. These days the Microsoft founder is all-in on decarbonization.

Investors should buy Occidental Petroleum (OXY).

Elon Musk appeared last year on the Joe Rogan podcast with an important message. The Tesla (TSLA) chief executive officer is passionate about climate change. He also has a long history of creating wealth and shepherding projects that are good for the planet. Decarbonization, the process of removing carbon from the atmosphere, achieves both.

Musk explained that humans are currently playing a crazy game with the environment. We are extracting large amounts of carbon buried deep underground and putting it into the atmosphere and oceans. Musk characterized this process as the dumbest experiment in human history.

He hopes to undo the effects of this process with XPrize, a $100 million fund to find viable decarbonization projects.

Bill Gates also understands that protects need to stand on their own merit, or perish.

Bill Gates told the New York Times last week that he is working with smaller decarbonization companies to make carbon capture, utilization and storage commercially viable. 

CCUS strategies are not currently profitable because converting carbon in the atmosphere to a solid state that can safely be buried underground is energy intensive, and costly.

Climeworks AG operates a CCUS facility near Reykjavík, Iceland. named Orca for the Icelandic word for energy, the facility looks like a giant vacuum. Huge fans suck contaminated sour gas out of the Icelandic sky to be rinsed with geothermal fluids from the Hellisheidi power plant, according to a report at Unesco.

When fully functional Orca will pull 4,000 tons of CO2 from the atmosphere. It helps that the plant is operated using inexpensive energy supplied by a nearby geothermal power plant.

Occidental Petroleum is best known for its petrochemical and oil and gas expiration businesses. However, the Houston, Tex.-based company got into carbon management 40 years ago, when it became apparent that the oil and gas industry was going to change dramatically as the world became greener.

CCUS is supposed to be the evolution of large oil and gas companies. The companies spent generations extracting carbon from the ground, and they are now in the best position to remove that contaminant from the atmosphere.

Occidental has two massive CCUS projects in the works. A Colorado facility will extract 725,000 tons of CO2 when it fully comes online. A West Texas project is slated to recover 700,000 tons according to a report at US News and World Report

The scale of these projects undoubtedly caught the eye of Warren Buffett, another billionaire investor. Berkshire Hathaway, his investmentv holding company, is the largest Occidental Petroleum shareholder, with 222 million shares, or 24.9% of the company.

What Buffet may see is the changing appetite for clean energy projects.. Republicans and Democrats in Washington are joining forces to embrace decarbonization. It's a "when pigs fly" moment that serious investors should understand. These businesses can be made viable by government incentives and credits.

At a share price of $62.89, Occidental Petroleum trades at 12.5 times forward earnings and 1.7 times sales. Shares could easily trade to $76 over the next 18 months, and advance of 20.8% from current levels.

Longer term investors can buy the stock up to $64.

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This article can also be found on Forbes.com.