The artificial rain making has been around for a long time and new methods are being tested all the time.
Like the one at the following web site: http://www.nature.com/news/2010/100502/full/news.2010.213.html

The weather changes can be detrimental to the local areas, but it is much worse if the changes are global in nature.
Perhaps the weather experiments have some effect on the global scale, but I think that there is a different reason for the world wide changes that are taking place.
To see that there are changes all over the world, you can start with some of these web sites:
http://en.wikipedia.org/wiki/Aral_Sea ,
http://www.bbc.co.uk/news/world-south-asia-15216875 ,
http://pubs.usgs.gov/fs/2009/3046/ ,
Excerpt from this site: http://vanishingsouthgeorgia.com/tag/south-georgia-rivers-creeks-lakes/

“This postcard image shows the pavilion and beach at Crystal Lake in its early days as a tourist attraction, circa 1964. Well known to locals since the 1860s, Crystal Lake was originally known as Bone Pond, for Willis Bone,”

“The lake has now almost completely dried up and is no longer open to the public. Owned by the Adcock Family of Tift County, it is leased as a hunting club today.”

Excerpt from this site: http://www.iugls.org/great-lakes-water-regulation-a-balancing-act.aspx

“For instance, the amount of water delivered to Lake Superior per month by Mother Nature has varied from 32 to minus 9 centimeters. The minus means there was more evaporation than precipitation and runoff to the lake that month.”

More evaporation than precipitation? I wonder if that is a relatively recent phenomenon. Could it have something to do with the “extra” energy we are distributing into the environment by converting mass into energy trough the nuclear processes?