Contents | Science 376, 6600
COVER Humanity’s actions have committed us to a warming climate and limited our options for mitigation. Although there is no turning back, some paths are still open to avoid catastrophic climate change and reduce its impacts. We must act now to drastically reduce greenhouse gas emissions and change our approaches to growing food, consuming products, and managing ecosystems to avoid a dire future. See page 1392. To get the carbon out of air travel, industry and government are trying, again, to turn farm