Why reflecting the solar's rays gained't save the planet | EUROtoday

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VSsome imagine that it’s important, others that it will be too harmful. Modifying photo voltaic radiation to fight local weather change remained a little-studied avenue till a couple of years in the past. This is not true immediately. More and extra research have come to supply some solutions on the assistance that these methods, known as SRM (Solar Radiation Modification), would offer within the local weather battle.

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Recently, the work of a younger doctoral pupil from the European Center for Research and Advanced Training in Scientific Computing (Cerfacs) sheds new mild on the implications of utilizing SRM. Susanne Baur confirmed, along with her colleagues Roland Séférian, Laurent Terray and Benjamin Sanderson, that removed from saving valuable time to finish the vitality transition, SRM – often known as “solar geoengineering” – might quite the opposite hinder the motion to decarbonize the economic system.

Solar geoengineering, or when science fiction turns into actuality

On the one hand, it includes reflecting a small a part of the solar's rays in order to not allow them to enter the ambiance. And then again to stop a few of those that entered from remaining trapped there due to the clouds.

Various strategies are talked about: making the oceans and land surfaces whiter to extend their reflective capability (albedo), lowering the variety of cirrus clouds – these filament-like clouds situated very excessive within the sky –, and even set up mirrors within the house. The most credible methodology at current is to inject sulfur dioxide into the stratosphere. This fuel prevents the solar's rays from passing by means of. In this fashion, we might briefly decelerate the development of world warming. For this, a whole bunch of planes must fly day by day at very excessive altitudes to be able to launch giant volumes of sulfur dioxide.

The main disadvantage is that we don't actually know the way the local weather would react to those injections. Would we be capable to decelerate international warming sufficiently? Is there a threat of making negative effects? In addition, the blocking energy of sulfur dioxide molecules is proscribed in time. In different phrases, if the injections stopped utterly at some point, we might see, a couple of weeks later, a really sudden bounce in temperatures. Too brutal to provide ecosystems time to adapt.

Experiments outdoors any authorized framework

To these questions, defenders of photo voltaic geoengineering reply that we not have the luxurious of not making an attempt. Their argument: it will solely be a brief resolution, the time to place in place the combo between nuclear vitality and renewable energies, and to develop carbon seize and storage applied sciences. Usurped argument, based on the work of Susanne Baur, as we are going to see.

Without ready for the arrival of a world legislative framework, SRM experimentation initiatives have multiplied in recent times. Thus, in 2021, a mission led by scientists at Harvard University, and financed by the billionaire founding father of Microsoft Bill Gates, aimed to vaporize calcium carbonate within the ambiance above northern Scandinavia. The mission was finally canceled resulting from concern amongst space residents.

The similar 12 months, Amazon founder Jeff Bezos used the supercomputers of the group he results in mannequin the results of injecting sulfur dioxide into the ambiance. Another firm, Make Sunsets, additionally performed exams in Nevada utilizing balloon releases containing sulfur dioxide.

Loss of effectivity of photo voltaic panels and wind generators

Whether experimental or theoretical, scientific research regarding photo voltaic geoengineering are nearly solely the work of American and Chinese researchers. “In Europe, there are only a handful of us who are looking into these issues,” says Susanne Baur, who’s herself of German origin. “I wanted to see for myself the effects that solar geoengineering would have. »

Previously, the young woman worked on carbon capture. In 2021, she joined Cerfacs, in Toulouse, and began a doctoral thesis under the supervision of Roland Séférian, bronze medalist from the CNRS in 2023 for his work on the climate system and the carbon cycle, and Laurent Terray, the one of the main authors of the 6th IPCC assessment report. Roland Séférian is full of praise for the work of Susanne Baur.

Taking the argument of the defenders of SRM against the grain, the young woman decides to explore its consequences on the efficiency of renewable energies. Because among the renewable energies, there is… solar energy! Solar panels and thermodynamic solar power plants need the Sun's rays to function. At night, for example, they do not provide a single kilowatt hour.

The results of his study, already published in the serious journal Earth System Dynamicsare clear: for an overall cooling of 2°C with the SRM, the electricity production generated by thermodynamic solar power plants and by solar panels would drop by up to 10%.

More surprising for the uninitiated, SRM would also impact the production of electricity by wind turbines by reducing, in certain regions of the world, the number of days when the winds blow enough to turn them. “By modifying the arrival of solar rays, we would modify the temperature gradient between the equator and the poles, which would affect air circulation across the world,” explains Susanne Baur.

Thus, no offense to its defenders, photo voltaic geoengineering wouldn’t assist restrict international warming, however, quite the opposite, would make the implementation of the vitality transition tougher.

Susanne Baur, who carried out her work utterly independently, suspects that opponents of the SRM won’t fail to depend on it of their lobbying actions. For her half, the researcher will submit her thesis manuscript this week. His oral protection will happen within the coming weeks. Once she has her doctorate, she is going to go away the world of analysis to work within the non-public sector on problems with atmospheric carbon seize and storage.


https://www.lepoint.fr/environnement/pourquoi-renvoyer-les-rayons-solaires-ne-sauvera-pas-la-planete-23-05-2024-2561007_1927.php