There are lots of questions about scalability and the best way to take advantage of this, but at the very least, if you live in the Southwest, replacing your lawn with native plants is a win-win-win.
From the Arizona Republic:
Professor Laurence A.J. Garvie of Arizona State University’s School of Earth and Space Exploration noticed something interesting while walking in the desert.
Garvie saw gritty, light-colored tailings within fallen, decaying saguaros. It turned out to be calcium carbonate – the same material that makes up chalk and caliche.
When a saguaro dies, it essentially makes a chalk line around its own body.
So what?
The significance is atmospheric.
All plants sequester – or trap – atmospheric carbon (CO2) as they grow. After they die, most of that carbon goes back into the atmosphere as the plant decays.
But when a saguaro dies, much of that carbon is transformed into an inorganic mineral that is sequestered for geologic time in the ground.
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And it isn’t just saguaros – although they are the most iconic example.
Garvie says all common species of cacti remove carbon from the atmosphere and sequester it in the earth as calcium carbonate.
You may have come across some of it when gardening. It’s called caliche and the desert plants have been producing it for millions of years.
“Our desert cacti are just like a coral reef,” says William Peachey, a saguaro researcher who discussed Garvie’s research during the annual meeting of the Tucson Cactus and Succulent Society earlier this year.
Coral reefs are known to transform atmospheric carbon into limestone, “our desert has a terrestrial equivalent,” says Peachey.






