"Two guys in a black Pontiac Vibe cruise the streets of Washington’s residential neighborhoods. The only sign of what they are up to is a gray plastic tube hanging out of the trunk. And the fact that they get out of the car frequently to place a black box on manhole covers and study its readings."
"Measuring how much methane gas is leaking from pipes under the District could help answer a key policy question. As natural gas production expands in the United States, do its benefits for the climate far outweigh its dangers?
Methane, the main component of natural gas, is about 25 times more powerful as a heat-trapping gas than carbon dioxide, the largest human contributor to climate change; the atmospheric concentration of methane has doubled since the start of the Industrial Revolution. While it largely dissipates in a few decades and there is far less of it in the atmosphere than CO2, it continues to drive global warming. Depending on how much leaks out in the journey from wellhead to homes and factories, some experts say, it could be enough to offset the advantages natural gas has over coal."