Our subway turnstiles often still say NO TOKENS, even though they have no token slots. Yesterday, we checked Hopstop for our trip out to Tortilleria Nixtamal in Queens and got a surprise stat: CO2 Saved: 3.21lbs. I love not having a car, and being able to read in transit. What I never connected before is that for every gallon of gas you burn, you blow out 20 pounds of CO2 from your tail pipe. Pretty surprising.