Yes

yes

A proof of 3 dimensional stresses for the mohr circle

Salt has been a proposed chemical to use in a process known as cloud seeding. This means that airplanes would fly through the clouds and disperse salt particles within them, which allow the water molecules to bind to them, become denser than the surrounding air and then fall as rain. While silver iodide and dry ice have been historically more popular in this type of geoengineering, salt is becoming more frequently used in the practice.

Greenhouse gas remediation projects are a type of geoengineering and seek to remove greenhouse gases from the atmosphere, and thus tackle the root cause of climate change. These techniques either directly remove greenhouse gases, or alternatively seek to influence natural processes to remove greenhouse gases indirectly. The discipline overlaps with carbon capture and storage and carbon sequestration, and some projects listed may not be considered to be geoengineering by all commentators, instead being described as mitigation