Mitt Romney's campaign opened an attack on the Obama administration's climate change policies yesterday by warning farmers that greenhouse gas regulations could hike fuel prices. He also suggested that President Obama might pursue a carbon-pinching cap-and-trade program if he wins the election. The new wrinkle in Romney's economic argument is a touchstone for rural voters in crucial swing states, where concern about the government's reach extends to field dust, pesticides and tractor emissions. It is also aimed at a key bloc of voters in must-have states like Ohio and Iowa. Go to story #1