It is possible to precipitate without seed crystals, referred to as homogeneous precipitation, that can occur under special conditions. This is called heterogeneous precipitation. It decreases the energy barrier that prevents the gaseous atoms from arranging themselves into the new solid or liquid structure. The particle serves as a seed crystal, or a nucleation site, because it provides a surface that makes precipitation possible and easier. Usually, the temperature drops and water begins to precipitate on a particle of something like dust or salt, called atmospheric aerosols. Rain, snow and ice precipitate out in the atmosphere in one of two ways. But these processes are uncontrolled and in some cases caused very big climate changes themselves that had their own bad effects.Įnter cloud seeding. We have seen the cooling effects of big fires and big volcanoes in the geologic record going back millions of years, so we know they work.

It’s why snow always melts first on a new asphalt street before most other surfaces around it. Darker albedos capture and hold heat, lighter albedos reflect heat.

Cooling also occurs when clouds dissipate fast and allow more radiation from the warmer surface below them to escape into space.Ĭhanging the Earth’s albedo, or reflectivity, is what these strategies target. Cooling occurs naturally when a greater amount of particles such as soot from huge fires, particulates and gasses from huge volcanic eruptions, or excessive amounts of ice crystals, enter the atmosphere and either block incoming solar rays or reflect them back into space. The other strategy is to mitigate the effects of warming by directly cooling the planet. So if we refuse to spend the amount of money and effort needed to reduce emissions, we certainly wouldn’t spend even more trying to get them back out. Much more expensive than preventing them from entering in the first place. Removing GHGs is really difficult and really expensive. So many scientists have wondered how to either remove GHGs from the atmosphere or mitigate the effects some other way. We have missed the previous two deadlines and 2020 doesn’t look to be on target either. But the longer we wait to begin decreasing, the faster we have to decrease every year. possible and reach near-zero human-made by 2050. In order to limit global warming to only a few degrees, we need to reduce emissions as fast as.

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