Cloud Seeder

With the threat of climatic instability seemingly on the rise, cloud seeding and other acts of geo-engineering may become increasingly important. Being able to fly and possessed of vastly superior technological ability, the Daleks are able to rise to this unique engineering challenge.



pre·cip·i·tate
[v. pri-sip-i-teyt; adj., n. pri-sip-i-tit, -teyt]
verb, -tat·ed, -tat·ing, adjective, noun
–verb (used without object)
.
Meteorology . to fall to the earth's surface as a condensed form of water; to rain, snow, hail, drizzle, etc.
.
to separate from a solution as a precipitate.
.
to be cast or thrown down headlong.

more of the many variations of meaning at http://dictionary.reference.com/browse/precipitate