Volts podcast: Dr. Ye Tao on a grand scheme to cool the Earth
In this episode, Dr. Ye Tao discusses his vision for combatting climate change by using fields of mirrors that reflect solar radiation.
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David Roberts
Geoengineering — using large-scale engineering projects to directly cool the Earth’s atmosphere — is an intensely controversial topic in climate circles. On one hand, such schemes strike many people as dangerous hubris, interfering with large-scale systems we don’t fully understand, risking catastrophic unintended consequences. On the other hand, there is good reason to believe that even a wildly successful program of decarbonization will not be enough to avoid devastating levels of heat in the atmosphere.
Dr. Ye Tao was early in his career as a researcher at Harvard’s Rowland Institute, working on nanotechnology, when he became gripped by the problem of climate change. As he dug into the research, he concluded that even rapid decarbonization — especially insofar as it reduces the aerosol pollution that temporarily cools the atmosphere — would leave the Earth roasting in levels of heat hostile to most life forms.
As he reviewed available options for carbon capture and geoengineering, he realized that none of them were safe or scalable enough to do the necessary cooling work in time. So he came up with a technique of his own: mirrors.
The MEER project — Mirrors for Earth’s Energy Rebalancing — is a nonprofit established to advance Tao’s vision, which involves covering some mix of land and ocean with fields of mirrors. The mirrors would reflect solar radiation, and thus heat, back up out of the atmosphere. If 10 to 15 percent of developed agricultural land could be covered with mirrors, Tao has calculated, it would return Earth’s heat to safe preindustrial levels, providing a range of local benefits to agriculture and water in the meantime.
It’s a brash idea, somewhere between crazy and obvious, and I was excited to hear more from Tao about why he thinks it’s necessary, how it would work, the materials that would be required, and how the MEER framework changes the way we view carbon dioxide in the atmosphere.
Alright. Ye Tao. Welcome to Volts. Thanks for coming on.
Ye Tao
Yeah, thanks for inviting.
David Roberts
Ye I have to confess when I first invited you on the pod, I had not yet really done a deep dive into into the MEER Project, and I was just sort of thinking, "Oh, a bunch of mirrors. How novel. That sounds fun. Let's talk about that." But I've spent a while now digging in and listening to more of your presentations and reading more, and there's really a lot going on here. There's a lot going on here. The mirrors are at the end of a sort of chain of reasoning that in many, many ways contradicts conventional wisdom about climate change.
So I do want to get to the mirrors. I'm excited to talk about the mirrors, but let's do a little background building first. So I want to start with, it seems like the key to understanding your whole framework here is the distinction between CO2 and heat. We sort of conflate carbon and heat. When we talk about climate change, what's the problem? It's more carbon, and carbon causes heat. How do we reduce heat? We reduce the carbon dioxide emissions. We sort of have those coupled in our mind. And you say it's important to decouple them. So talk a little bit about why we need to keep them conceptually distinct, and then also decouple them in terms of the physics of the system.
Ye Tao
Okay, yeah, that's a good place to start. It's true that we created this problem by emitting CO2, and it's important to shut it down as quickly as we can manage, practically. And in the Earth system, everything is basically linked. So it's only natural that when you perturb one important componen
