Learned that as a Boy Scout. When we were leaving bivouac we had to stretch out in a line arms distance apart and walk across the entire area, instructions were if it didn't grow, pick it up and it didn't matter if it was not our trash. My father whipped us good if we ever threw a piece of trash on the ground. I too (presently) work for the Sierra Club, not as an employee but volunteer. The only access I've seen this group fighting against is commercial exploitation. The Sierra Club encourages individual access, even gives people a John Muir era back pack when you join and maps of trails. The SC would never support GOP efforts to sell off, or open up to commercial exploitation, our public lands.