Last year Harvard scientists ran a test that concerned sending hint quantities of aerosol—not sufficient to have a significant impact—into Earth’s stratosphere, roughly 20 km excessive. The aerosols comprise compounds like sulfate, which may replicate incoming daylight and cut back global temperatures. A paper revealed in 2017 within the journal Atmospheric Chemistry and Physics claimed injecting aerosol into the ambiance mimics the ash plume from a volcanic eruption. Additionally, like an ash plume, as soon as inserted into the decrease stratosphere, the aerosol will shortly unfold out, thus affecting large areas of the planet.
Researchers are additionally trying into launching an enormous parasol into the house to handle the quantity of solar radiation hitting Earth. For instance, a 2018 paper from the Journal of Aerospace Technology and Management describes launching what the authors name the HSS or Huge Space Shield. The plan is to place a thin, huge sheet of carbon fiber right into a Lagrange point, which is a comparatively secure level within the advanced system of gravitational pulls between the Earth, moon, and solar. The sheet would solely block a small portion of solar radiation.
Others wish to block the solar by stimulating cloud formation, a course of often called cloud seeding. For rain to fall, moisture within the air must condense, which means it wants the temperature to drop and one thing to summarize round—a fascinating idea known as nucleation. Naturally, water droplets nucleate spherical mud particles, pollen, sea salt, and even bacteria. However, scientists have confirmed that compounds like silver iodide or dry ice can work as effectively. The plan is to inject the environment above drought-susceptible areas with these substances, thus growing cloud cover and rainfall.