Geoengineering Won’t Save Our Oceans

Photo by flickr user nashworld under a Creative Commons license

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Last month I wrote about geoengineering, controversial schemes to deliberately manipulate the Earth’s climate to slow the planet’s warming. I focused mostly on a proposal often called “solar radiation management” (PDF), in which sunlight is blocked in the upper atmosphere in order to reduce warming at the planet’s surface. A new study, cowritten by one of the main sources in my piece, Stanford’s Ken Caldeira, makes a major conclusion about this type of geoengineering: It may cool the planet, but it won’t prevent dangerously high levels of carbon dioxide from wreaking havoc on our oceans.

As MoJo’s environmental correspondent Julia Whitty has written, our oceans are already at their breaking point: Man-made emissions have negatively impacted the ocean’s chemistry, and toxic waste is being dumped into our oceans without regard for its harmful impact on fragile marine ecosystems. To make matters worse, scientists fear that large-scale geoengineering proposals could cause further acidification of our oceans (for instance, the sulfur injected into the atmosphere in a solar radiation management scheme would fall back to the Earth’s surface through precipitation), damaging the lifeforms that live there. More recent geoengineering studies (PDF), however, allayed those fears, finding that solar radiation management wouldn’t acidify the oceans as much as first anticipated.

Nonetheless, the Caldeira report finds that our oceans and coral life are in grave danger—and even the best-case-scenario geoengineering scheme to block out the sun’s rays won’t help the oceans much. Paired with a report from earlier this year stating that global warming is essentially irreversible, that CO2 will hang around in the atmosphere for around a thousand years or so, the Caldeira paper suggests that solar radiation-related geoengineering efforts aren’t worth pursuing.

Perhaps geoengineering researchers would be better off focusing on ways to remove CO2 from the atmosphere, like synthetic trees that “scrub” the CO2 out of the air. After all, why waste time, money, and manpower on a geoengineering scheme like solar radiation management if, as this latest research suggests, it won’t do much to save our planet?

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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