Humboldt Redwoods (IMAGE) University of California - Irvine Caption Redwood forests such as this one in California's Humboldt County are key components of the state's climate change mitigation efforts, but UCI researchers suggest that ongoing greenhouse gas emissions may limit the ability of trees to remove carbon dioxide from the atmosphere. Credit Shane Coffield / UCI Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.