Geoengineering still faces major practical challenges
Solar geoengineering still faces major practical hurdles, including a lack of suitable delivery vehicles, uncertain side effects on weather and agriculture, and difficult governance challenges, keeping it a distant and risky option.
Background
Geoengineering refers to large-scale, deliberate interventions in Earth's climate system to counteract global warming — most commonly, solar radiation management (reflecting sunlight back to space) and carbon dioxide removal. While most public debate focuses on governance, ethics, and risks (e.g., "who controls the thermostat?"), this article examines the lesser-discussed engineering hurdles: the colossal infrastructure, materials science, and logistics problems involved. Key approaches include stratospheric aerosol injection (dispersing reflective particles via planes or balloons) and marine cloud brightening (spraying sea salt into low clouds). Neither has been tested at scale, and the practical gaps — from nozzle clogging to particle distribution uniformity — remain enormous.