States with aggressive climate goals like Oregon are facing a conundrum. Electric vehicles can help reduce emissions in the transportation sector, the nation's largest source of greenhouse gas emissions; but they also mean less gas tax revenue in government coffers. Revenues from gas taxes paid by drivers at the pump are projected to decrease as more people adopt electric and fuel-efficient cars. That's forcing officials nationwide to look for new ways to fund transportation infrastructure. According to the National Association of Budget Officers, motor fuel taxes are the largest source of transportation revenue for states. But the money they bring in has fallen.

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WASHINGTON — Taxing hybrids and other fuel-efficient cars and billing drivers for miles driven are among the approaches being suggested to ave…