Finally, Neil deGrasse Tyson and “Cosmos” Take on Climate Change

Looked at in the context of our planet’s history, what we’re doing to Earth appears dire indeed.

Fox/National Geographic

If you’ve been reading my semiregular dispatches about the Fox and National Geographic series Cosmos—far and away the most rational show on television—then you know that for some time, I’ve been not-so-subtly predicting that the program was going to tackle the scientific issue of our time, climate change. It seemed to me that in order to be true to the legacy of Carl Sagan, a man who epitomized the quest to use science to solve humanity’s problems, you simply couldn’t avoid this topic.

And sure enough, last night, it happened (watch here).

Neil deGrasse Tyson and Cosmos got into the climate issue in their typically expansive way: By surveying the state of the Earth in an array of ancient periods and looking at the dramatic transformations it has undergone due to forces ranging from continental drift, to asteroid impacts, to ice ages. Rearrangements of continents, waves of extinctions, and dramatic fluctuations in climate were the norm, not the exception, throughout this calamitous past.

And some of these dramatic changes set in motion where we are now. For instance, surveying the Carboniferous period of the planet’s history 300 million years ago, Tyson explained how the development of plant life on Earth, and especially trees, greatly changed its atmosphere, producing a great deal more oxygen. Yet at the time, Tyson noted, fungi and bacteria didn’t have any means of consuming these trees when they died. So, they just gradually sunk under the mud and soil.

“Eventually, there were hundreds of billions of trees, entombed in the Earth,” explains Tyson. “Buried forests, all over the Earth. What possible harm could come from that?”

Cosmos‘s “Ship of the Imagination,” with Neil deGrasse Tyson at the helm, surveys the Earth from space. Fox/National Geographic

The answer is a great deal, once the carbon content of these deposits of former life was unleashed into the atmosphere. And that’s why, while we’ve been living in a period of climatic optimum—one that made human civilization possible— for the last 10,000 years or so, we’re about to seriously mess it up. So begins Tyson’s climate dirge:

We just can’t seem to stop burning up all those buried trees from way back in the carboniferous age, in the form of coal, and the remains of ancient plankton, in the form of oil and gas. If we could, we’d be home free climate wise. Instead, we’re dumping carbon dioxide into the atmosphere at a rate the Earth hasn’t seen since the great climate catastrophes of the past, the ones that led to mass extinctions. We just can’t seem to break our addiction to the kinds of fuel that will bring back a climate last seen by the dinosaurs, a climate that will drown our coastal cities and wreak havoc on the environment and our ability to feed ourselves. All the while, the glorious sun pours immaculate free energy down upon us, more than we will ever need. Why can’t we summon the ingenuity and courage of the generations that came before us? The dinosaurs never saw that asteroid coming. What’s our excuse?

That’s a pretty strong statement, made all the stronger by the mega-scale perspective on the Earth that impels it. And thus, Cosmos continues to deliver on the greatest hopes of its fans and, apparently, its creators: To use a mass media platform to, at last, take on science rejectionism and set the deniers straight.

On our most popular episode of the Inquiring Minds podcast, Tyson explained why he doesn’t debate science deniers, and much more. You can listen here (interview starts around minute 13):

More MotherJones reporting on Climate Desk


Mother Jones was founded as a nonprofit in 1976 because we knew corporations and the wealthy wouldn't fund the type of hard-hitting journalism we set out to do.

Today, reader support makes up about two-thirds of our budget, allows us to dig deep on stories that matter, and lets us keep our reporting free for everyone. If you value what you get from Mother Jones, please join us with a tax-deductible donation today so we can keep on doing the type of journalism 2019 demands.

We Recommend


Sign up for our newsletters

Subscribe and we'll send Mother Jones straight to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.


Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.


We have a new comment system! We are now using Coral, from Vox Media, for comments on all new articles. We'd love your feedback.