1. Let’s Talk Gas Emissions
American Gas Association
April 4, 2014

2. Harlem – March 12, 2014

3. Boston University Professor Nathan Phillips with his CO2 and methane measuring instruments. (Photo: Bruce Gellerman)

4. Ed Markey files bill to plug gas leaks
National Grid uses 'Sniffer truck'
to detect gas leaks
Updated: 03/25/ :46 PM
“Freezing and repeated thawing doesn't just create potholes. National Grid says a wild swing in temperatures can also affect underground pipes.”
Environmental group mapping gas leaks across Mass.
BY ERIN AILWORTH
GLOBE STAFF   MARCH 21, 2014

5. MARCH 21, 2014

6. National Grid’s Infrastructure Investment

7. Sources: Chart from AGA.org. Information from DOT, EIA, EPA