In cold weather, can you save the world from overheating by driving a car that's fossil-fueled but is carrying a battery that weighs over 400 pounds?

GM Says Chevy Volt Passes Winter Test | PersonalFinanceBulletin.com

Chevy is suggesting that to minimize the drain on the lithium ion battery, during cold weather conditions; a “smart-phone” would allow remote starting of the car, while still plugged in. This would enable the Chevy Volt to draw power from the grid, while the inside is heated. The battery would then stay fully charged.
...Another energy saving feature is that the heated seats in the Volt, do not use as much power as heating the air, which will benefit the driver and passengers.

The Chevy Volt is designed to travel for about 35 miles, from one charge of its 16Kwh battery. However, in cold conditions, that figure will be reduced. The vehicle comes with a 1.4 liter, 84 horsepower engine, able to provide 344 miles on one tank of gas and give extra heat.

The maximum speed of the Volt listed at 100 miles per hour, has battery weighing 435 pounds, which powers an electric-drive unit.