ClimateWire: Americans' cars are getting bigger and they're driving more than ever before -- two reasons why U.S. transportation emissions continue to grow despite fuel economy standards, experts say.
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Ingrid Fol chose her minivan, a 2007 Honda Odyssey, because it gets good mileage. Now that gas prices have gone down, the Northern Virginia resident said, there's less pressure to make every gallon count.
"When it was $3-something, I would try to stay within a budget, and choose to...