The ocean is a major source of natural aerosols. Air-sea exchange of particulate matter contributes to the global cycles of carbon, nitrogen, and sulfur aerosols. Four other significant sources of aerosols are terrestrial biomass burning, volcanic eruptions, windblown dust from arid and semi-arid regions, and pollution from industrial emissions. Natural variations of aerosols, especially due to episodic large eruptions of volcanoes, have a large amount of faulty for climate change. There are several ways in which humans are altering atmospheric aerosols and not only near the ground. Aerosols force climate in two ways, direct, and indirect. The effect of aerosols on clouds is highly speculative. The theory is that the more aerosol, the smaller the cloud droplets tend to be, and clouds with more but smaller drops have a higher albedo. This would increase the planetary albedo, thus have a cooling effect.
