Halle Berry is known for rolling up her sleeves and getting her hands dirty for a good cause. Yesterday, not only was Berry working with an Inglewood charity, but she lent some prime advertising space to the green movement. On her T-shirt, words shaped like a lightbulb, gave some simple instructions on how we all can help better our environment. The shirt read: "Insulating your water heater can save 1,000 pounds of carbon dioxide a year and moving your thermostat down 2 degrees in the winter and up 2 degrees in the summer can save 500 pounds a year. Compact fluorescent lightbulbs save 60% more energy than regular lightbulbs. 50 billion pounds of carbon dioxide would be reduced if every US household switched to energy-saving lightbulbs."