Résumé
This presentation explores geoengineering – a set of ideas aimed at cooling the planet if cutting greenhouse gas emissions isn’t enough to stop climate change. It looks at two main strategies: Solar Radiation Management (SRM) and Carbon Dioxide Removal (CDR).
SRM methods try to reflect more sunlight away from the Earth. These include techniques like injecting particles into the upper atmosphere, making clouds more reflective, or thinning certain types of clouds. While these could cool the planet, they also come with risks, such as changing rainfall patterns or affecting the ozone layer.
CDR approaches focus on removing carbon dioxide (CO₂) from the atmosphere. This might involve planting coastal vegetation, spreading crushed rock on land, or making the oceans more alkaline so they absorb more CO₂.
The presentation makes it clear that geoengineering is not a substitute for cutting emissions, but something to consider if those cuts fall short. These technologies raise big scientific and ethical questions, and this talk aims to provide a framework for understanding them and starting a public conversation about their future use.