Nationwide, it adds up to more than $15.7 billion overall in taxes and bonds for land and water conservation, the most in a quarter-century of elections, according to the trust's data, which was independently verified by The Associated Press. The dynamic has shown up even in tax-averse Alabama, where 75 percent of voters amended the constitution in 2012 to fund open spaces with oil revenues after a campaign targeting hunters and environmentalists. Florida voters are considering a constitutional amendment that would dedicate $18 billion in existing real estate taxes to environmental protection over the next two decades. [...] drought-suffering Californians are being asked to pass Proposition 1, a $7.5 billion voter initiative to fund more dams on the Sacramento and San Joaquin Rivers to improve water supplies in the central part of the state, where most of the nation's fruits and vegetables are grown. The Natural Resources Defense Council is backing Proposition 1, but the Sierra Club decided to not take a public stance, concerned that resource conservation funding could be dwarfed by the billions going to concrete in the form of new dams.