New research from the USGS shows that fossil fuels produced on federal lands accounted for over 20% of U.S. emissions in recent years. Yet there are numerous ways in which federal lands might instead lead decarbonization.

Climate change impacts on the biosphere tend to increase carbon emissions (a postive feedback). Meanwhile, the impacts on human activities may reduce carbon emissions by a similar amount (a negative feedback). Bad news for both nature and humans, but the feedbacks may largely offset each other.

Concurrent drought and heat extremes in the future may cause substantial decreases in barley yields, leading to dramatic regional decreases in beer consumption (e.g., -32%) and increases in beer prices (e.g., +193%) in some years.

In the first study to use a fully-coupled Earth system model to look at the future climatic effects of trans-Arctic shipping, we find that clouds formed in response to shipping emissions may offset ~1°C of the overall warming trend in the Arctic by the end of the century.

Although there are many options for reducing energy-related CO₂ emissions, some energy services entail emissions that are much more difficult to eliminate. We review technological opportunities and barriers for eliminating and/or managing difficult-to-decarbonize services, and critical areas for further research, development, demonstration and deployment.

"South-South" trade among developing countries is increasing, and helping to reduce China’s emissions by shifting energy-intensive production to less developed regions. But this may make climate mitigation more challenging; emissions are spread among more and less-developed countries.