By Adele Peters   December 07, 2023 Last fall, on a farm in Northern Wisconsin, a farmer spread 1,421 metric tons of crushed volcanic rock on his fields before planting soybeans and corn. The rock dust, from a startup called Lithos, serves two purposes: For farmers, it increases yields. It also helps capture carbon. The … Continue reading Why tech giants are putting $57 million into crushed volcanic rock →