More than 20 international hotel chains are touting the newly developed Hotel Carbon Measurement Initiative as the first step in an industrywide standard for measuring hotels’ carbon footprints.

The initiative — known as HCMI 1.0 — is designed to clear up confusion about the impact hotels have on the environment. It standardizes methodology and requires transparency in reporting. The effort began in 2011, led by the World Travel & Tourism Council, the International Tourism Partnership and a working group of 23 hotel companies. HCMI 1.0 was tested in 50 properties worldwide ranging in size and location.

The methodology aims to make it easier for clients, particularly corporations, to measure the overall carbon costs of their businesses. As more companies start to factor employee travel into their carbon footprint calculations, the initiative could mean businesses will start choosing hotels based on their carbon emissions scores.

The 23 international hotels chains involved are Accor, Beijing Tourism Group, Carlson Rezidor Hotel Group, Diamond Resorts International, Fairmont Hotels and Resorts, Hilton Worldwide, Hong Kong & Shanghai Hotels, Hyatt Corp., InterContinental Hotels Group, Jumeirah Group, Mandarin Oriental Hotel Group, Marriott International, Meliá Hotels International, MGM Resorts International, Mövenpick Hotels & Resorts, Orient-Express Hotels Ltd., Pan Pacific Hotel Group, Premier Inn — Whitbread Group, Starwood Hotels & Resorts Worldwide, Shangri-La Hotels and Resorts, the Red Carnation Hotel Collection, TUI AG and Wyndham Worldwide.