Politics (from Greek: πολιτικά, translit. Politiká, meaning "affairs of the cities") is the process of making decisions that apply to members of a group.
A weapon that comes down as still As snowflakes fall upon the sod; But executes a freeman's will, As lightning does the will of God; And from its force, nor doors nor locks Can shield you; 'tis the ballot-box.
To understand changes observed in the aerosol layer of the stratosphere, scientists use remote sensing to collect relevant data. EU funded scientists are now 4D modelling aerosol formation and transport, in particular after volcanic eruptions.