Many of the companies promising 'net zero' emissions to protect the climate are relying on vast swaths of forests and what are known as carbon offsets to meet that goal.
Satellites offer a more complete record than on-the-ground reports collected at offset projects. That allowed us to assess all of California since 1986.Carbon isn't being added to these projects faster than before the projects began or faster than in non-offset areas.
Many of the projects are owned and operated by large timber companies, which manage to meet requirements for offset credits by keeping carbon above the minimum baseline level. However, these lands have been heavily harvested and continue to be harvested. In some regions, projects are being put on lands with lower-value tree species that aren't at risk from logging. For example, at one large timber company in the redwood forests of northwestern California, the offset project is only 4 percent redwood, compared with 25 percent redwood on the rest of the company's property. Instead, the offset project's area is overgrown with tanoak, which is not marketable timber and doesn't need to be protected from logging.
One recommendation is to begin using satellite data to monitor forests and confirm that they are indeed being managed to protect or store more carbon. For example, it could help foresters create
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