LANSING — Democratic presidential candidates are pushing climate change plans that would require all new cars to be fully electric in the next decade or two, goals that could upend Michigan automakers and reshape the workforce of the state’s largest industry.

But experts say the proposals may be unrealistic given political realities, automaker production plans and current consumer purchasing preferences.

“It’s challenging even before you get to the question of technicality,” said Barry Rabe, a professor at the University of Michigan’s Gerald R. Ford School of Public Policy. “This is going to be a really tough political issue.”

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