PS : Survey
Source 1 : http :// www . nawcinc . com / wmfaq . html
S2 : http :// www . worldbookonline . com / student / article ? id = ar458550 & st = clo ud-seeding
S3 : http :// www . 2facts . com / icof _ story . aspx ? PIN = i1500140 & term = cloud + seedi ng + saudi + arabia
S4 : http :// www . reference . com / browse / wiki / Silver _ iodide
S5 : http :// science . howstuffworks . com / nature / climateweather / meteorologists / cloud-seeding1 . htm
S6 : http :// www . scientificamerican . com / article . cfm ? id = cloud-seedingchina-snow
S7 : http :// archives . smdailyjournal . com / article _ preview . php ? id = 121045
S8 : http :// reason . org / blog / show / deaths-from-hurricanes-floods-droug
S9 : http :// www . chacha . com / question / how-many-people-die-per-yeardue-to-food-shortage