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Climate change: Can we talk about geo-engineering?

April 23, 2021

We need to talk about the benefits and risks that surround purposely altering the planet, says James Fahn, author of A Land on Fire

Twenty years ago, I worked briefly at the National Oceanic and Atmospheric Administration for a program that seemed hard to argue with – we distributed funds to help countries adapt to climate change.

Yet we faced some resistance, from climate change deniers and some climate activists. They felt that if people and governments came to believe we could comfortably adjust to global warming, we would not work to prevent it.

In 2021, we face a similar situation regarding proposals around ‘geo-engineering’. There is reluctance to even test these ideas, lest they be taken up as an alternative to reducing carbon emissions.

But we do need a global debate on geo-engineering, both because it could help ameliorate some of the effects of climate change, and because it is so risky.

Treating symptoms, treating disease 

The climate situation has become more dire.  Even if countries meet their current commitments under the Paris Agreement, that would still likely lead to warming of well over two degrees Celsius, a level predicted to be catastrophic for human civilisation. That is why experts are calling on world leaders to set more ambitious targets for cutting carbon emissions, either at the virtual summit being hosted this month by President Biden or at the global climate summit scheduled for November.

Purposeful attempts at geo-engineering may therefore seem tempting to lessen some of the impacts of climate change we are already seeing in the decline of vital ecosystems, climate-induced conflict and migration, and more extreme weather events.

One approach is to try to draw more carbon out of the atmosphere. But technological efforts to do this are so far too expensive. Planting a lot more trees could also help, but although global forest cover is increasing, it is not happening at a scale that is needed. And we are losing rainforests and other ecosystems that are most effective at storing carbon.

The other main geo-engineering approach is to block a small percentage of the solar radiation hitting the Earth, most feasibly by pumping lots of aerosols or other small particles into the atmosphere. The idea is to essentially mimic the effects of volcanic eruptions like that of Mount Pinatubo in June of 1991, which effectively reduced the average global temperature by about 0.6 degrees Celsius over the following 15 months or so.

While a compelling idea, it is an approach that treats one of the main symptoms of the climate crisis rather than the proverbial disease. The effects would be short-lived – the atmospheric aerosols would have to be continually replenished – and it would not do anything to reduce the build-up of greenhouse gases in the atmosphere, or to treat some major impacts such as ocean acidification.

Are geoengineering opponents short sighted?

It is also risky. Dampening solar radiation would probably reduce agricultural output in some regions and could disrupt rainfall patterns. Most scary are the potential unknown impacts. The history of human intervention in the biosphere has not gone well.

Furthermore, how do we decide who can or should take such actions? It is conceivable that governments acting alone, private companies, or even individuals may decide the impacts of climate change are so severe they have to take a geo-engineering approach to counteract them, or to carry it out as a de facto alternative to cutting fossil fuel consumption.

Climate change affects the poor of the earth

Given the risk of rogue, unilateral action, we need to have an open, global discussion about geo-engineering in the media and other public channels.

For the past decade, my organisation has helped bring hundreds of journalists from countries that are highly affected by climate change — such as Bangladesh or Samoa — but because of their size or economic power, are largely left out of high-level negotiations on climate.

Ultimately, to get to a global agreement on when and if geo-engineering tactics are warranted, we need to involve those most affected – not only those with the power to take action.

Prevention vs cure 

If geo-engineering sounds like something out of science fiction, well, the one institution that seems to have no compunction publicly speculating about it is Hollywood. Geo-engineers seem to be the villain du jour, whether they try to achieve their goals by reducing the human population or reducing global temperatures, with disastrous results.

However, some forms of carbon capture would seemingly have few opponents if they could become affordable and feasible. But most geo-engineering efforts come with considerable risk.

As we have found with efforts to inform people about adapting to climate change, there is another benefit to raising public awareness about geo-engineering: it can help make people realise that, whether talking about disease or climate change, an ounce of prevention is worth a pound of cure.

James Fahn, author of A Land on Fire and executive director of Internews’ Earth Journalism Network

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