Razib Khan's Unsupervised Learning

Andrew Song: cooling the planet with technology

Apr 23, 2025
In this engaging conversation, Andrew Song, co-founder of Make Sunsets and NYU economics graduate, dives into the urgent need for geoengineering to combat climate change. He argues that current emission-reduction strategies have failed and advocates for innovative solutions like injecting particulate matter into the stratosphere to reflect sunlight. The discussion also covers the economic feasibility of such projects and the importance of public trust in environmental interventions. Song challenges conventional views and highlights the potential of technology to address climate challenges.
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ANECDOTE

Disappearance of Green Algae Example

  • Razib noticed a disappearance of green algae in Oregon springs over recent years.
  • This change was due to hotter summers baking away the algae, illustrating local climate impacts.
ADVICE

Cost-Effective Climate Cooling

  • Deploying sulfate aerosols in the stratosphere is a highly cost-effective way to cool the planet.
  • The annual cost is under $10 billion, far less than the damage costs from climate disasters.
INSIGHT

Challenges in Geoengineering Initiatives

  • Despite academic efforts, geoengineering efforts face major opposition, especially from local communities.
  • Commercial startups like Make Sunsets try to succeed where government and academia have failed due to lack of urgency.
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