GreenTech 2015, held in Seattle May 27-29, received its PLANETAIR certification as a carboneutral event. For the second consecutive year, Green Marine purchased carbon offset credits to neutralize the  the climate footprint of its annual conference. All factors were taken into account: conference site, accommodations, food, supplies, land, air and ferry transportation, paper, etc. for a total of 69.8 tons of CO2 emitted.