The Sacramento Delta has immensely fertile peat soil. But the land is sinking due to farming. Some farm land now lies below sea level, protected by levees. But this can and does lead to catastrophe when levees fail.
California is starting a carbon market. It may now be possible for farmers to plant tule, a tall reed, in the Delta and get paid for storing carbon by creating new wetlands. This will have an important added benefit of raising the land level too.
I’m highly skeptical of carbon markets. But this could help save the imperiled Delta, which is where much of the water for southern California comes from.