Cooling an area with clouds and powders will require a permanent fleet of airplanes or stratospheric rockets, which would automatically imply huge maintenance costs. It is possible to dump in the upper atmosphere small particles, that will reflect a percent of solar radiation.Īll these solutions are for the moment. This technology can be used during night, to allow heat from the atmosphere radiate into the outer space. There are other chemicals able to dissolve clouds. These clouds could reflect part of solar light, keeping temperature low for a while. If there is not enough moisture, we could also spray droplets of water. By deploying tiny crystals of salt in the upper atmosphere, they will absorb moisture and create a cloud. The cheapest and most easy to find is salt. There are chemicals able to help atmospheric water to condense. The technology is similar, but instead of gasses, we will use water droplets or small particles. These methods might be useful for a planet orbiting between Earth and Venus, but certainly will not be useful closer to the Sun then Venus. Since they will need time to reach the poles, there, heat will escape into space. They can be deployed around the equator, to reflect solar radiation, preventing certain areas from warming. Other gasses have a half-life around an year. However, if they are extremely short lived (with a half-life of a day), they can cover specified areas during day, while in night, they vanish, allowing heat to escape into space. Left alone, they have a greenhouse effect.

These gasses reflect part of the light and heat.

Terraforming endless space 2