AUTHOR=Renforth Phil , Wilcox Jennifer TITLE=Specialty Grand Challenge: Negative Emission Technologies JOURNAL=Frontiers in Climate VOLUME=1 YEAR=2019 URL=https://www.frontiersin.org/journals/climate/articles/10.3389/fclim.2019.00001 DOI=10.3389/fclim.2019.00001 ISSN=2624-9553