IT DOESN’T WORK: None of the technologies have a track record, all of them come with major risks and unknowns, and in some cases the effects would be obviously catastrophic.
WEAPONIZATION: Computer models show that geoengineering interventions can have regional winners and losers; to the extent that geoengineering successfully changes climate patterns in a predictable way, it will inevitably be weaponized.
DETRACTS FROM REAL SOLUTIONS: By promising a quick fix, geoengineering threatens to delay the implementation of a transition away from fossil fuels, and could redirect funding and investments away from real climate solutions. Some geoengineering proposals require vast amounts of energy, which means less climate-friendly energy for everyone else.
HUMAN RIGHTS AND BIODIVERSITY: Many geoengineering proposals require the intensive exploitation of vast amounts of land (in the case of BECCS, twice the size of India!). Those projects would inevitably displace millions of people and potentially wipe out entire ecosystems.