Researchers along the California coast have been using sensors to test whether eelgrass—an underwater plant with quarter-inch wide leaves that can grow up to 3 feet long—can remove carbon from seawater and help maintain water chemistry. The idea is that, through photosynthesis, eelgrass can absorb carbon and fight ocean acidification. Thus far, the research is promising, suggesting that restoring areas with eelgrass could counter the effects of climate change while making water more hospitable to ecologically valuable organisms.