_:genid1 "Free to use with credit to the original figure source."^^ . "citizen-science" . "2.17"^^ . "Citizen science"^^ . "Retrieved January 2015 from National Park Service wildland fire website on citizen science"^^ . "Citizen science refers to the engagement of non-professional volunteers in scientific investigations—asking questions, collecting data, or interpreting results. This approach can be especially useful in tracking environmental changes. (Source: NPS)"^^ . _:genid1 . . . . . . _:genid2 . _:genid2 . _:genid2 . _:genid2 .