A pilot project underway in Marin County could open the door to a new, lower-cost and lower-carbon method of wetland restoration. photo credit: Courtesy of CA State Parks FoundationA great egret at China Camp State Park’s wetlands. It is hard to think of a tidal marsh as being in danger of sea level rise. After all, it is already surrounded by water. But a tidal marsh — like the 100-acre wetland at China Camp State Park in southern Marin County — is essentially a water garden that depends on sunlight and shallow shores. Its grasses shelter unique fish that feed birds and special status species like the salt marsh harvest mouse and golden eagles.As seas rise, marshes can drown and become open water, wiping out entire ecosystems that people and animals depend on unless they are…..