Final answer:
The specific website used to find Carl, a teacher in Colorado without arms, is not provided in the question and lacks any factual reference. Context is needed to provide an accurate answer.
Step-by-step explanation:
The website through which the Greens found Carl, a teacher in Colorado who didn't have arms, is not specified in any factual or historical resource that is accessible up to the current knowledge cutoff. Such information would typically stem from a specific personal story or anecdote which may have been shared in a book, video, or an interview. Without more context, it's not possible to provide an exact answer. If this query is related to a particular lesson, book, or story being studied in a class, it would be best to refer back to the related materials where this anecdote is mentioned.