Measure the impact of carbon offset projects on management of California forestlands. There are two types of offset projects. First, under the California Cap-and-Trade Program, the Air Resources Board has the authority to approve forestry compliance offset projects. Project types include reforestation, improved forest management, and avoided conversion. Second, there are voluntary forestry offset projects that have been approved by voluntary agencies such as the Climate Action Reserve (Reserve), the American Carbon Registry (ACR), and the Verified Carbon Standard (VCS). The acreage in California being managed for carbon offset projects provides a measure of the impact of these programs on actual forest management in California, in terms of land managed to maintain or improve carbon storage, and to provide additional environmental benefits such as improved water quality and habitat.