TripAdvisor has rolled out its green hotels program across Europe for the growing body of guests who want to travel with a conscience.

After launching in the US last year, TripAdvisor has expanded its GreenLeaders scheme to Europe; the guide was designed in consultation with the United Nations Environment Programme.

Eligible properties that qualify as a GreenLeader in the industry are identified by a leaf and awarded a Bronze, Silver, Gold or Platinum award.

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Properties are assessed against a set of criteria that includes everything from the re-use of linens and towels, recycling, and composting to solar panels and electric car charging stations.

The expansion is in response to growing interest among travelers who’ve expressed a desire to reduce their carbon footprint.

SEE ALSO: HOW TO FIND A GREEN HOTEL

According to the results of a survey that polled more than 14,025 TripAdvisor users in Europe, 26% of travelers said they considered the environment when booking their accommodation in the last 12 months.

When asked if environmentally friendly factors would play a role in booking reservations over the next 12 months, that figure spiked 33%.

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Since March of this year, TripAdvisor has awarded 2,000 new properties across Europe with a GreenLeaders designation, including properties owned by Accor Hotels, Marriott International, Hilton Worldwide, and Club Med.