 But a new study confirms widespread doubts about the potential for most forests in the western U.S. to help curb climate change. The authors warn that many western forests could see a rapid acceleration of carbon loss in the coming years or decades. They say these challenges have the potential to compromise carbon storage capacity and undermine our ability to mitigate climate change. This is now. It's been now. Geoengineeringwatch.org has been disclosing this for 15 years. Our forests are no longer carbon sinks. They're carbon sources.