Operational cloud seeding for precipitation enhancement continues worldwide even though scientific proof of the efficacy of seeding, according to the stringent “proof- of- concept” criteria set forth by Silverman (2001), is lacking. Those conducting these operational efforts have weighed the evidence and concluded that the potential benefits from precipitation augmentation in their programs outweighed the risks and costs involved. Many of the current operational cloud seeding programs are being conducted in Texas where ten cloud seeding projects were in operation in 2002.