Tourism organizations collaborate on unifying hotel carbon measurement August 31, 2011 The International Tourism Partnership (ITP) and the World Travel & Tourism Council (WTTC) are collaborating on a groundbreaking initiative to unite hotel industry efforts to calculate and communicate The International Tourism Partnership (ITP) and the World Travel & Tourism Council (WTTC) are collaborating on a groundbreaking initiative to unite hotel industry efforts to calculate and communicate carbon impact by agreeing on a standardized methodology and metrics. For the first time, leaders within the hotel industry are collaborating to reach a consensus on a single methodology for calculating carbon footprints and consistent metrics for communicating emissions.