On the Planet: Blue vs Green

A major regional gas station chain has long had a "blue planet" marketing theme emblazoned on their pumps. It leaves me a little puzzled. The more gas we burn, the more greenhouse gases we release, the more the polar ice caps melt, the bluer the planet gets, right? So is this gas good or bad, and will it make the planet bluer or greener? In contrast, the EPA has a Green Vehicle Guide.