http://thomas.loc.gov/cgi-bin/query/z?c109:S.517:
There are 2 versions of Bill Number S.517 for the 109th Congress
1 . Weather Modification Research and Technology Transfer Authorization Act of 2005 (Introduced in Senate)[S.517.IS]
2 . Weather Modification Research and Technology Transfer Authorization Act of 2005 (Reported in Senate)[S.517.RS]
http://uscode.house.gov/download/pls/15C9A.txt
"(2) Weather modification technology has significant potential
for preventing, diverting, moderating, or
ameliorating the
adverse effects of such disasters and hazards and enhancing crop
production and the availability of water;
a·mel·io·rate ( P ) Pronunciation Key (-mly-rt)
tr. & intr.v. a·me·lio·rat·ed, a·me·lio·rat·ing, a·me·lio·rates
To make or become better; improve.