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Opinion: Geoengineering Is the Only Solution to Our Climate Calamities

If global warming were an extraterrestrial adversary, it would not have to fear a diplomatically unified Earth. The past decade of climate summits in Copenhagen, Bali, Cancun, and Paris have only nudged us towards the limp goal of business as usual until 2050. One wonders how much ice will be left in Greenland by then, and how many billions will have died from the ecocide of rising sea levels, endless droughts, and other climate-change-related catastrophes, to say nothing of the already tragic effects of natural disasters such as the wildfires burning with ever greater intensity in California. Even in the best of times, collective action doesn’t come naturally.

The time has come to place our faith in technological innovation rather than universal enlightenment. We have been wrestling with our habitat, and now it is fighting back. We are locked in a violent embrace in search of a new equilibrium.

If the Industrial Revolution and borderless capitalism are the forces that have brought us to this environmental apotheosis, then it will have to be geoengineering moon shots and scientific collaboration that buy us time to reverse the damage. Geoengineering proposals generally fall into two categories: removing carbon from the atmosphere, or shielding Earth from solar radiation. The most ambitious proposal for carbon removal involves fertilizing the ocean with iron sulfate and other nutrients to stimulate algae growth that could potentially revitalize the marine food chain while also absorbing atmospheric carbon. In terms of slowing global warming, injecting sulphur dioxide aerosol particles in the atmosphere would reflect sunlight and cool temperatures across the globe.

One might recoil at such audacious plans to intentionally alter the geophysical environment, yet that is precisely what we have unintentionally been doing for the past century. At least this time we can direct our efforts in the right direction. As Stewart Brand memorably wrote in the first edition of the Whole Earth Catalog in 1968, “We are as gods and might as well get good at it.”

We have a long way to go before we gain divine mastery over nature. More than a dozen iron fertilization experiments have been undertaken in the past two decades, but only two have resulted in any carbon being absorbed into the deep sea. Despite this limited success, in 2008 the United Nations Convention on Biological Diversity imposed a moratorium on such efforts.

Solar geoengineering lags even further behind. To date the only significant real-world initiative in the field is Harvard’s Stratospheric Controlled Perturbation Experiment (SCoPEx), which plans to inject calcium carbonate particles high above the Earth to reflect some of the sun's rays back into space, effectively simulating a volcanic explosion over a small patch of desert in the southwestern US. Beyond the science, the chief obstacle to the project, according to director David Keith, is that funding agencies fear backlash from environmental groups. Similar to the fate of ocean fertilization, in 2019 a Swiss-backed proposal for a multilateral research initiative on atmospheric geoengineering was rejected.

This is as ironic as it is unacceptable. Activism has neither stopped oil producers (whether Saudi Arabia, Russia, Canada, or the US) from pumping hydrocarbons nor industrial consumers (such as China, India, the US, and Japan) from consuming them. The crucial change agent has been technology, primarily nuclear, solar, and wind power. But even under the best-case scenarios of renewable energy adoption, we are past the point of no return: Accumulated carbon emissions will wreak ever more havoc on all living organisms. It is well past time to abide by the precautionary principle—an ounce of prevention is worth a pound of cure.

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We need to get all hands on deck. The combined resources of progressive government agencies, the scientific community, and private backers represent the political willpower, technical know-how, and financial muscle necessary to offset the current trajectory of 2°C or higher temperature rise, which estimates suggest could cost tens of billions of dollars per year. European and Asian governments support geoengineering in principle, and it now has bipartisan support in the US, which recently approved $4 million for the National Oceanic Atmospheric Administration (NOAA) to assess solar climate interventions. But this is half-hearted, timid support, and it will not be enough.

The environmental “Manhattan Project” we need would also require pooling together the innovation and resources of Bill Gates, who has invested billions in concentrated solar power and fusion reactors, Elon Musk, who has nearly single-handedly created the supply and the demand for a commercially viable market for electric vehicles, and potentially Jeff Bezos, whose Earth Fund is directing at least $10 billion towards climate initiatives, as well as other tech visionaries and the research organizations they support. Hopefully, today’s climate protagonists are already working to launch a range of geoengineering schemes, even if they have to do so in secret, shielded from climate-change-denying politicians and interest groups masquerading in the name of democratic accountability.

Governments and environmental advocates are right to demand that all organizations involved in geoengineering transparently disclose their funding, objectives, and results on sites such as Geoengineering Monitor. But right now, it is more important for such projects to be scaled in the first place. Given the infant state of geoengineering techniques and the cowardly state of global regulation, moral hazard is hardly our biggest concern. Governments and activists can continue to push for strong emissions reductions while blunting the consequences of those already choking us at the same time.

At this point, we no longer have any choice but to rely on scientific cost-benefit calculations to drive the climate agenda. But there is still a vital need for national efforts to shorten global supply chains for food and energy. The silver lining to climate disruptions, Covid border closures, and trade wars could be encouraging more countries to invest in local agriculture, whether organic or hydroponic greenhouses, plant-based proteins, and converting food waste into energy. Local self-sufficiency is a sensible step towards collective resilience. In the so-called circular economy, everyone can be part of the geoengineering solution.

Not all geoengineering is the stuff of Hollywood fantasy. Planting billions of trees from Canada and Russia to Brazil and China is an obvious example of building carbon sinks and refortifying habitats at the same time. Cloud seeding has been used since the 1970s and could help ameliorate today’s droughts. Coating fresh ice with white sand to reflect more light so it can strengthen rather than melt is another less invasive treatment for the wounded Earth. Of course, each of these approaches has its own challenges and limitations, ones that will require us to commit resources other than simply flying diplomats to summits to sign empty promises. Let us not pretend there is any other way to reduce the widening climate injustice.

WIRED Opinion publishes articles by outside contributors representing a wide range of viewpoints. Read more opinions here, and see our submission guidelines here. Submit an op-ed at

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