NYT: Biggest Carbon Sin is 'Air Travel'... New York Times Your Biggest Carbon Sin May Be Air Travel NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is 'Air Travel'... about 19 tons of carbon dioxide in a year fewer airplane trips NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times about 19 tons of carbon dioxide in a year NYT: Biggest Carbon Sin is 'Air Travel'... the New York Times NYT: Biggest Carbon Sin is 'Air Travel'... a disproportionately high amount per flight NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... generates about 19 tons of carbon dioxide in a year NYT: Biggest Carbon Sin is 'Air Travel'... regulations New York Times NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times generates about 19 tons of carbon dioxide in a year "Your Biggest Carbon Sin May Be Air Travel" New York Times New York Times NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is 'Air Travel'... New York Times New York Times New York Times NYT: Biggest Carbon Sin is 'Air Travel'... New York Times calculates NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times "Your Biggest Carbon Sin May Be Air Travel" NYT: Biggest Carbon Sin is 'Air Travel'... about 19 tons of carbon dioxide in a year NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... about 19 tons of carbon dioxide in a year New York Times NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... 2 to 3 tons NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times a disproportionately high amount per flight NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... "Your Biggest Carbon Sin May Be Air Travel" New York Times NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times generates about 19 tons of carbon dioxide in a year NYT: Biggest Carbon Sin is 'Air Travel'... "Your Biggest Carbon Sin May Be Air Travel" NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is ‘Air Travel’… New York Times NYT: Biggest Carbon Sin is 'Air Travel'... 2 to 3 tons NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is 'Air Travel'... generates about 19 tons of carbon dioxide in a year NYT: Biggest Carbon Sin is 'Air Travel'... generates about 19 tons of carbon dioxide in a year New York Times the New York Times NYT: Biggest Carbon Sin is 'Air Travel'... New York Times NYT: Biggest Carbon Sin is 'Air Travel'... NYT: Biggest Carbon Sin is 'Air Travel'... New York Times