Every day we alert our readers of new startups in the travel industry being listed on AngelList, as an early information service for those who keep track of such things. Every weekday, there will be a list of these newbies, along with each of their mini-profiles.

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Photo Credit: BookGreener gives travelers authoritatively-rated access to eco-friendly hotels worldwide, and every time they book a hotel, BookGreener plants a tree. BookGreener