Includes bibliographical references.

"Humans started adding fossil CO₂ to the atmosphere about 300 years ago and accelerated land use emissions by expanding croplands and pastures. The unintended consequence of these activities is a 120 ppm increase in atmospheric concentration of CO₂, which is now changing our climate. In response, international action is being taken to reduce net greenhouse gas emissions and limit global warming below 2°C. Most climate mitigation technologies are intended to decrease the rate at which we take additional carbon from fossil fuel reservoirs and ecosystems and add it to the atmosphere as CO₂. These include renewable electricity, increased energy efficiency, and carbon capture and storage of emissions from fossil power plants. This report focuses on the reverse: technologies that take CO₂ out of the atmosphere and put it back into geologic reservoirs and terrestrial ecosystems. These negative emissions technologies, or NETs, have received much less attention by researchers than traditional mitigation technologies"--Preface. Coastal blue carbon -- Terrestrial carbon removal and sequestration -- Bioenergy with carbon capture and sequestration -- Direct air capture -- Carbon mineralization of CO₂ -- Sequestration of supercritical CO₂ in deep sedimentary geological formations -- Synthesis -- Glossary -- Acronyms and abbreviations -- References -- Appendix A. Committee bios -- Appendix B. Disclosure of conflict of interest -- Appendix C. Coastal blue carbon : macroalgae -- Appendix D. CO₂ flux calculation -- Appendix E. Carbon mineralization -- Appendix F. Geologic storage.