Explanation:

The most common agents used in “cold rain” or snowpack augmentation cloud seeding projects are silver iodide and dry ice (frozen carbon dioxide). Other agents like liquefied gases (liquid nitrogen for example) can be used to seed clouds

Learning: These iodide particles rise into the clouds, cause moisture to freeze. These particles act as a base for water vapours to settle on that later crystallises and falls as rain or snow.

It is not fool proof as seeded clouds may actually travel to another location and do not cause precipitation on the intended location.

Moreover, there are environmental consequences of spreading of harmful chemicals in atmosphere. It is also very expensive technique. If it is not controlled properly, it may result in undesirable weather conditions like flooding, hail, storms, etc.