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Colorado has a pilot program where beer brewers are selling the carbon dioxide they produce to pot growers.

Carbon dioxide is often used by commercial growers to speed growth.

I love the cleverness. They are creating a market for a GHG. It may not be important on a global scale, but it's something.

"The state of Colorado and three small businesses are trying a novel approach to reduce carbon emissions that sounds like something out of the fever dreams of Willie Nelson: using carbon dioxide produced from beer brewing to help marijuana plants grow...

The governor signed a bevy of laws to facilitate such a transition, including a bill that set a target for a 50 percent reduction in greenhouse gas pollution below 2005 levels by 2030.

“This is excellent and shows how to close the carbon cycle,” said Alissa Park, an engineering professor at Columbia University whose research focuses on capturing CO2 from industrial sources before it enters the atmosphere. “We need to develop a new carbon economy, a new way of seeing things at the end of the day.”

https://www.washingtonpost.com/climate-solutions/instead-of-releasing-this-greenhouse-gas-beer-brewers-are-selling-it-to-pot-growers/2020/02/11/cf1410ae-49c3-11ea-b4d9-29cc419287eb_story.html