9. Mitigation by Geoengineering

The chapter begins by acknowledging the inevitability of climate change despite efforts to reduce fossil fuel use, highlighting the need for additional mitigation strategies. It introduces geoengineering as a means to reduce greenhouse gas levels and slow global temperature rise. The text explores two primary geoengineering approaches: Solar Radiation Management (SRM) and Carbon Dioxide Removal (CDR). SRM aims to cool the Earth by reflecting sunlight away from the planet, with methods such as stratospheric aerosol injection and marine cloud brightening. The chapter discusses the potential benefits and risks of these techniques, including the possibility of unintended consequences and the need for careful monitoring. CDR, on the other hand, focuses on removing carbon dioxide directly from the atmosphere. The text examines various CDR methods, including biological approaches like reforestation, geochemical processes such as enhanced weathering, and engineered solutions like direct air capture. It also addresses the challenges of scaling up these technologies and the importance of durable sequestration. The chapter delves into the economic and political barriers to implementing geoengineering, including the high costs and the need for international cooperation. It also discusses the potential for geoengineering to be used as an excuse to continue burning fossil fuels, emphasizing the importance of decarbonization alongside geoengineering efforts. The text concludes by highlighting the urgency of addressing climate change and the need for a multi-faceted approach that includes geoengineering, decarbonization, and other mitigation strategies. It provides a comprehensive overview of the current state of geoengineering research and offers insights into the future of this field, making it an essential read for anyone interested in the latest developments in climate science and environmental engineering.