The first experiment to cool the Earth will be launched in 2019

A new report from Harvard scientists says a global solar filtering program for the entire planet will cost $ 2 billion a year. So little, compared to other grandiose experiments, that scientists have returned to the idea of ​​creating a man-made layer in the atmosphere to reflect sunlight. Still, the consequences of global warming are in plain sight, and $ 2 billion is really not such a big investment.

Scientists honestly admit that they are not ready to calculate the risks of large geoengineering decisions, and therefore all experiments will first be carried out on a micro scale. To do this, they plan to create a special man-made cloud and see how it will reflect sunlight and what it will lead to. This is the essence of the experiment planned at Harvard next year.

Scientists are about to launch a stratospheric probe, which at a given height will spray 100 grams of calcium carbonate, a substance with excellent reflective properties and, in addition, light enough for a cloud to last for days, maybe even years. The probe all this time will patrol nearby and supply scientists with information about the behavior of the cloud.

No results are expected from the experimental cloud in minimizing the heating of the atmosphere by the light of the Sun. But it will serve as a prototype for the creation of large clouds, help to understand how to manage such objects and what to expect from them in practice. The creation of such protective barriers is unlikely to help solve the problem of global warming, but it can become a tool for local impact. So that people learn how to cool the planet's surface by analogy with how today they already know how to take rain away from cities.