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In 2015, the National Fire Protection Assn. began publishing emergency field guides for alternative fuel vehicles as part of its safety training program.

Chemists have developed a novel way to capture and convert carbon dioxide into methane, suggesting that future gas emissions could be converted into an alternative fuel using electricity from renewable sources.

Ministers have decided not to support the use of hydrogen as an alternative fuel for heating homes, though they say it will have an important role in and around industrial sites.

"But the ketogenic diet can provide ketones as an alternative fuel to glucose for a brain with energy dysfunction."

The state also offers a tax waiver on clean alternative fuel vehicles, which applies only to new cars valued at $45,000 or less, or used that run $30,000 or less.