Is there a specific name for this style of photography or is it just generic-hipster-instagram stuff?
I should add that the 'environment' term isn't because of the nature/outdoors elements - it's not the definition in that sense.
Just google 'environmental portrait' and you'll see lots of examples.
Interestingly, this whole genre is taken from one single painting Caspar David Friedrich's 'Wanderer above the Sea of Fog’(1818).
The 'silhouetted individual looking at a larger than life landscape' concept basically went through this lineage:
Friedrich -> art photographers -> hollywood movie posters -> hipster instagram photographers
yeah since no one would have come up with it if it wasn't for that painting...
showing off the scale of something by using a
familiar scale reference like a person isn't really a style.