Can Geoengineering Avert a Climate Catastrophe?

Why It Matters

Geoengineering could become a last‑resort tool if emissions cuts fall short, making its scientific and regulatory scrutiny critical for global climate strategy.

Key Takeaways

• Solar radiation management could temporarily lower global temperatures
• Implementation risks include precipitation changes and ozone layer impacts
• Governance frameworks remain undefined, raising geopolitical concerns
• Research costs estimated at $10‑$30 billion over 20 years
• Public acceptance low due to perceived unnatural climate manipulation

Pulse Analysis

Geoengineering, once a fringe concept, has entered mainstream climate discourse as scientists explore ways to reflect sunlight or remove carbon directly from the atmosphere. Solar radiation management (SRM) techniques—such as stratospheric aerosol injection—promise rapid cooling, potentially buying decades for economies to transition to net‑zero energy sources. Yet laboratory trials reveal complex feedback loops, including possible shifts in monsoon systems and impacts on the ozone layer, underscoring that short‑term gains may carry long‑term ecological costs.

Parallel to SRM, carbon‑dioxide removal (CDR) strategies like direct air capture, bioenergy with carbon capture, and enhanced weathering are gaining traction. Pilot projects demonstrate that scaling these technologies could sequester billions of tonnes of CO₂ annually, but the capital outlay remains steep, with estimates ranging from $10 billion to $30 billion over the next two decades. Moreover, the energy intensity of many CDR approaches raises questions about their net climate benefit, especially if powered by fossil‑derived electricity. Researchers caution that without robust monitoring, unintended consequences—such as soil nutrient depletion or ocean acidification—could offset intended climate gains.

Policy makers face a paradox: the urgency of climate mitigation pressures governments to consider geoengineering, while the lack of an international legal framework fuels geopolitical tension. Existing treaties, like the UN Convention on Biological Diversity, touch on geoengineering only tangentially, leaving a governance vacuum. To move forward responsibly, the article argues for coordinated, publicly funded research programs that prioritize transparency, risk assessment, and stakeholder engagement, ensuring that any future deployment is guided by science rather than desperation.