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Title : Why Climate Engineering Won't Work
link : Why Climate Engineering Won't Work

Why Climate Engineering Won't Work

by Anders Levermann
Huffingtonpost

From drought California Typhoon Vanuatu, extreme weather events are becoming more difficult to ignore, and global warming will worsen our situation. Therefore, climate engineering is the great temptation of our time: If there is too much heat on the planet, we will block some sunlight and continue as before. Only one problem: It will not work. The fundamental physics tells us that the place where the warming is larger in the Arctic, reflecting sunlight back into space has the effect of smaller cooling. And the Arctic, which is crucial for US and European weather systems.

In order to counter global warming, several techniques to reflect sunlight into space have been suggested. The only one that is simple and cheap enough to be seriously discussed at the time was presented by Paul Crutzen, winner of the Nobel Prize for advancing our understanding of stratospheric chemistry of the ozone layer. He suggested to inject tiny particles - sulphate aerosols, to be specific - in the stratosphere to protect Earth from a certain portion of solar radiation and thus cool the planet. Since then, the whole research fields have developed around the idea. While the industry and politicians seem to love, from the perspective of a physicist, it is obvious that the method has a basic problem. In blunt terms: we can not save climate change


This is basic physics..

The reason is as simple as basic: Additional abundance of greenhouse gases in the atmosphere does not change our climate in a uniform manner. The Arctic, for example, is warming almost twice as much as the tropics. This has to do with a well-known effect called polar amplification. The main reason for this is that warming increases the amount of water vapor in the atmosphere, which then snow-off in the dry and cold polar region where it releases energy and warms the atmosphere. Now, if this sounds too complicated, you just have to hold a thermometer in the Arctic and the other in the tropics. They show that the temperature in the North is increasing faster than in Ecuador

Now, reflecting sunlight back into space would have the exact opposite pattern. It would do much in the tropics, where sunlight is strong, and less in the Arctic and Antarctic. This is fundamentally true and can not fix. Therefore, reflecting the radiation back into space could cool the planet on average, but can not reverse the effect of greenhouse gases - even remotely

Although we use the average global temperature as. an indicator of climate change by man, causing the change is, in fact, complex. Due to global warming, rainfall patterns around the globe changing an inhomogeneous way. Some wetter regions, others get dryer. wind patterns are changing, weather extremes are likely to intensify. All these phenomena have different patterns. And although not yet fully understand these patterns, which are unique in the simple fact that they are caused by the additional abundance of greenhouse gases that humans are emitting into the atmosphere. greenhouse gases produce a specific global fingerprint in all weather events. This fingerprint is unique because of the role of these gases in the energy balance of our planet.

greenhouse gases anthropogenic absorb radiation from the Earth's surface back into space and send some back to the earth. This mechanism is very different from simply shines more sunlight to us. If there is too much sunlight warming was a real problem, then we could try to counteract it by reflecting part of the sunlight back into space. But that is not the case.

Only a number.

To put it another way, the idea of ​​Paul Crutzen give us a single command to change the Earth's climate. With a command that could control: The amount of sulfate aerosols into the stratosphere. With such a "parameter control" could control exactly a property of the climate system, for example, the average global temperature or temperature or precipitation in China in the United States. But he could not control rainfall in China and the temperature in the United States at the same time.

Since the greenhouse gases in the troposphere change our different climate in different places, a knob is not enough. It is physics that tells us clearly that will not work. The only thing that works is to undo what we have done -. So we have to reduce emissions of greenhouse gases and even try to remove some of them from the atmosphere

If you do not want to spoil our climate, it is time to put the sterile debates on technical climate engineering to rest and focus on the only real solution, which is a tremendous challenge that requires all our intellectual resources: mitigation of emissions of greenhouse gases . The first place to address this challenge must be the place of emissions originating :. Our energy systems based on fossil fuels

"Why Climate Engineering Won't Work", article source: riseearth.com

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