On this episode of Unsupervised Learning, Razib talks to Andrew Song, co-founder of Make Sunsets. An NYU graduate with a degree in economics, Song was a member of the Y Combinator class of winter 2016. Before becoming a founder, Song worked at firms involved in data analytics and artificial intelligence. A repeat attendee at the Founders Fund "Hereticon" conference, Song's company has been profiled IEEE Spectrum, The New York Times and NPR.

Razib and Song first talk about the current state of climate, or more precisely, climate change and anthropogenic global warming. Song argues that the emission-reduction strategy has fundamentally failed, and global warming is inevitable absent a drastic strategy shift. Enter geoengineering, the deliberate large-scale manipulation of an environmental process that affects the earth. In the context of global warming Song proposes that humans engage in proactive efforts to cool the world. His company, along with a similar Israeli startup, proposes to introduce particulate matter into the stratosphere to reflect back some of the sun's radiation. Razib asks Song what the reaction has been, given that the atmosphere is a public resource, and how he proposes to eventually make it a revenue-generating business through government contracts. More generally, Razib and Song talk about other geoengineering projects, including Augustus Doricko's dream of increasing precipitation through his Rainmaker firm.