Shortly after President Obama was elected, he decreed that all Federal Agencies measure the amount of greenhouse gases they use and work to reduce this number. A class example: "That which gets measured, gets improved."
At the Department of Energy, they found that Sulfur Hexafluoride, SF6, was the biggest culprit since it had 24,000 times the effect on the atmosphere as CO2. By going after leaks of this gas, used to insulate high voltage experimental machines, they were able to reduce leaks by half and take the equivalent of 200,000 cars off the road. They will continue to go after the worst culprits in classic Pareto style.