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Enhancing the Albedo Effect

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Enhancing the Albedo Effect
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Abstract
The term Climate Engineering (CE) specifically describes large-scale technical methods that can be used to reduce the concentration of CO2 in the atmosphere or to reduce incoming solar radiation. Recently, some scientists and politicians have begun discussing the possibility of using CE to deal with climate change.
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Transkript: Englisch(automatisch erzeugt)
With albedo, we mean that not all of the sunlight is absorbed by the earth, but some of it is just reflected back into space. If you have a look at that picture of the globe behind me, you will see it's not only dark, but we see a lot of bright white, and these are clouds.
So these white clouds reflect the light back into the atmosphere, and that's what we call albedo. So if we somehow manage to enhance the albedo, the reflectivity of our planet, we will have less light that is reaching the ground and is converted into heat, and therefore we have less warming by the sunlight.
And all methods that try to enhance the albedo of the planet are considered albedo methods. So enhanced stratospheric clouds, enhanced tropospheric marine clouds, but there of course are other more speculative ideas out there, like change plants to reflect more sunlight, or paint rooftops white,
or use concrete that reflects more sunlight in construction. Just assume that you need to change the albedo of 1% of the earth's surface, and then you can easily calculate that the total earth's surface is like 5 times 10 to the 14 square meters,
so you would have to paint 5 times 10 to the 12, which is 5 trillion in European trillion square meters. And then you multiply that by, let's say, $1 per square meter,
and you end up in a huge amount, and you have to replenish that paint every year, so that will be a huge effort for, let's say, a little effect. And lots of people would have to paint. Yeah, lots of people would have to paint, right.