The town of Carrboro, North Carolina — population 21,000 or so — filed a lawsuit against the utility giant Duke Energy this week, adding another layer to the onion-like collection of climate-related litigation still growing around the country. The town is alleging that Duke, which provides electricity to more than 8 million customers in North Carolina and five other states, played a leading role in a “nationwide climate deception scheme” that is now costing Carrboro residents millions thanks to increasing flooding and other impacts.