With global temperatures likely to rise beyond the 1.5°C target set by climate experts, negative emissions technologies — most notably direct air capture (DAC) — become increasingly important for addressing CO2 already in the atmosphere. A new DAC approach is being pursued by Holocene Climate Corp. (Knoxville, Tenn.). Holocene’s system is unique in its ability to operate at low temperatures, while still employing an aqueous-based approach amenable to traditional chemical-engineering scaling benefits.