About the Authors

Lewis H. Ziska

l.ziska@ars.usda.gov

Affiliation Crop Systems and Global Change Laboratory, United States Department of Agriculture, Agricultural Research Service, Beltsville, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LHZ. Performed the experiments: LHZ. Analyzed the data: LHZ. Contributed reagents/materials/analysis tools: LHZ. Wrote the paper: LHZ.