In2016filmmaker/photographerPeteMcBrideandwriterKevinFedarkosetoutona750-milejourneyonfootthroughtheentirelengthoftheGrandCanyon.Morepeoplehavestoodonthemoonthanhaveaccomplishedthistask.Theirquestwasmorethanjustanendurancetest—itwasalsoawaytodrawattentiontotheunprecedentedthreatsfacingoneofou...