Lot of that in Kansas. Grass is one of the best solar farms there is, using solar energy to convert CO2 into oxygen, H-C bonds (sugars and starches) and biomass (cellulose) and storing much of it underground.

The Kansas tallgrass prairie was probably one of the best carbon sinks on the planet (along with the Russian Steppes and the Argentine Pampas) and about 150 years ago, right about the time we really needed to not do so, 98% of it was plowed under, and the 60 million grazing animals that lived there were almost completely exterminated.