I think this is a really complicated question because everything we do and don't do has consequences. What is a preferred outcome or consequence to our actions is deeply personal and not really relevant to the mountains. The mountains will survive and thrive regardless of what we do, almost certainly in a different form than we saw it since nothing is static in a natural world. The poem Hamatreya captures this sentiment well. Here is an excerpt:
“Here is the land,
Shaggy with wood,
With its old valley,
Mound and flood.
But the heritors?—
Fled like the flood's foam.
The lawyer and the laws,
And the kingdom,
Clean swept herefrom.
“They called me theirs,
Who so controlled me;
Yet every one
Wished to stay, and is gone,
How am I theirs,
If they cannot hold me,
But I hold them?”
What people often try to do is defend the earth from the ravages of humans that are transient in nature. This is nicely highlighted in an interview by This American Life called The Hiker and the Cowman Should be Friends.
But here, in the Escalante, in these canyons, I think the grazing doesn't hurt anything. A canyon bottom, like the gulch, they trail cows through there. And I've seen people, campers, in there. And they see these cows go through, and pound up the ground, and crap everywhere. And then the campers scream about the cows, say how horrible they are. The campers go back to the city. And a month later, I go back down to the same canyon, and you can't tell there was ever a cow in it. It's grown up with grass and clover.
In the piece they describe a story about a person who would go hiking in an area and see the "destruction" of nature by grazing cattle. The "destruction" the outsiders saw was generally transitory. Grant Johnson used to fight the ranchers but over time he realized the ranchers weren't an evil bunch trying to destroy the land but very much in tune and part of the land. I'm not trying to say that all ranchers are saints and all activists are fighting non-issues. The truth is clearly more muddled. I'm just trying to say that sometimes things aren't as clear cut as either side presents.
I think this is one of the factors that leads to conflicts like the ones between hunters and anti-hunting activists. Both groups want to see large healthy herds. The anti-hunting activists don't want hunters killing the animals. The hunters think culling the herd is better than overpopulation resulting in starving out animals during the winter. When both groups work together then it is a win-win-win. When they attack each other as diametrically opposed enemies resources are lost that could have helped effect the outcome both groups want.
So if you want to give back to the mountains I think it is important to note that what you're doing is trying to change a landscape to something you think is better, or maintain a landscape's status quo because you feel this is how the landscape should be. As you can see these are very personal decisions and it is unfortunately easier to dismiss your "opposition" as bad/evil/{insert negative adjective}. However I think it is often best to work with people who seem to be opposed to you because they might see an angle you don't.
Once you've made your decisions you have three broad categories of actions you can take: change your behavior, influence others, and directly perform works. Since these are a bit abstract I'll give some concrete examples
You are concerned about global warming's affect on glaciers and snowpacks.
- Change your behavior
- Reduce your carbon footprint
- Influence others
- Raise awareness in your community
- Vote for politicians that prioritize global warming
- Donate to lobbying groups that want to fight global warming
- Fund research into global warming
- Directly perform works
- Plant trees on property you own
- Get permission to plant trees on property you don't own
Of course there are more things you could do in each category. Here is another example.
You notice lots of trash in your favorite areas.
- Change your behavior
- Don't leave trash
- Pack out any used toilet paper instead of burying it
- Adopt the best practices of organizations like Leave No Trace.
- Influence others
- Raise awareness in your community with speaking events with photos of the trash
- Purchase advertising space to raise awareness for this problem
- Donate to organizations that clean up trash in this area, or would be willing to clean up trash in this area
- Get the local authority over the land to install and service trash cans in the area
- Get permission to place signage reminding people not to litter
- Talk to people on the trail about the trash problem
- Directly perform works
- Pack out trash you find
- Place signage you have permission to place against littering
You want to combat the erosion that occurs on your favorite trails.
- Change your behavior
- If you walk the trail less then there will be less erosion.
- Don't walk on the trail when you're likely to cause increased erosion (walking on the trail during the rainy season)
- Influence others
- Raise awareness in your community with speaking events with photos of the erosion
- Donate to organizations that maintain the trails
- Get the local authority over the land to improve the trail or allow you to improve the trail
- Talk to people on the trail about the importance of staying on the trail
- Directly perform works
- Improve the trail with permission
As you can see you can adapt any change you want to see in the outdoors to this three pronged approach. Always be mindful of how your efforts affect the system as a whole.