Technology to create rain has been around for quite a while now. Actually, you can fly up in the sky or launch a rocket which will distribute small particles of special silver to create rain. This method has been used before and nations still do it today. In 2008, China used this method to control weather during Olympic games. Chinese researches say they were able to create artificial snow too.
The problem in using this special silver chemical is because of it's toxic characteristics. Toxic levels of this method have not been proved yet. Therefore, there is a need to develop an alternative technology which has been presented by researchers from Zheneva. Even though, the results of their work is far from actual rain and potentially more dangerous than special silver chemical. With the help of Teramobile mobile laser lab (which develops the laser) researchers were able to reach a density in the sky of few rain drops. This project is far from finished but it's definitely a piece of technology customers like farmers and other nations could benefit from if it's not toxic.