"Florida environmentalists are hoping voters will approve a ballot amendment on Tuesday to fund the purchase and conservation of land critical to protecting the state's water supply."

Here's InsideClimate News' pick of the top ballot measures to watch on November 4, along with some other roundups of ballot measures related to energy and environment.

"Biotech and supermarket giants are spending more than $25 million to defeat ballot initiatives in two western states that would require labelling of foods containing genetically modified organisms."

"Hydraulic fracturing is on some local ballots in California and Texas, and the oil and gas industries are fighting against the potential restrictions."

"The benchmark American oil price fell below the symbolic $80-a-barrel threshold on Monday, swooning to two-year lows, after Saudi Arabia aimed to shore up its dwindling exports to the United States by cutting its selling price for the American market."

"In the largest-ever penalty for a violation of the Clean Air Act, the Korean automakers Hyundai Motor and Kia Motors will pay the federal government a combined $300 million as part of a settlement for overstating vehicle fuel-economy standards on 1.2 million cars, Justice Department and Environmental Protection Agency officials said on Monday."

"Governments can keep climate change in check at manageable costs but will have to cut greenhouse gas emissions to zero by 2100 to limit risks of irreversible damage, a U.N. report said on Sunday."

"CANBERRA, Australia — A bid by environmentalists to confront world leaders with a digital billboard highlighting climate change has been thwarted by Brisbane airport authorities who deemed the message too political."

"U.S. drivers will pay an average of less than $3 per gallon on Election Day, according to AAA."

"The Obama administration released thousands of pages on Friday documenting federal agencies’ vulnerabilities to climate change and what those agencies plan to do about it."