Cloud Seeding !

Cloud Seeding is a practice which is widely done now a days. It is a attempt done to increase or decrease the amount and type of precipitation. It is done by dispersing some type of substances (mainly chemicals) in the atmosphere which alters the micro-physical processes within the cloud. We may say that these substances work as a catalyst within the clouds which may increase or decrease the rate of processes within the cloud. We have listened that the trees cause rainfall but we never tried to know how is done. The answer is:
Trees produce TERPENES in the warm weather conditions which acts as a natural form of cloud seeding. TERPENES are released by some insects example: Mites and Swallowtail butterflies. Terpenes are a large and a varied class of hydrocarbons which are mainly released by Coniferous tress example: Pine. The name "terpene" is derived from the word TURPENTINE. Turpentine obtained by the distillation of resins obtained from trees.
As there are many natural processes which helps in cloud seeding, there are many man-made processes which too contribute in cloud-seeding. Now-a-days silver iodide and dry ice are used as agents for cloud seeding. Seeding of cloud can only take place when they contain liquid water at temperature less than zero degree Celsius. Now the question arises that:

HOW THESE CHEMICALS ARE DISPERSED IN THE AIR?
ANS. These chemicals are dispersed by the aircraft and through dispersion devices on the land. On release of these chemicals from the ground these chemicals are dispersed by air currents.

CLOUD SEEDING "A CURSE !"
Cloud seeding appears to be a curse for humanity as we have introduced ourselves to cases like this. We know that during the summer Olympics in Beijing the China launched rockets to stop rain in the opening and the closing ceremony of the Olympics which resulted in drought which lasted for several months.