To Sierra Nevada. This is simple math remedial with the hope you can grasp the scale of things. How ridiculous is to pick only on the horses! And using the beloved green solar potties does not make the waste evaporate. It decomposes just like horse waste only slower.
Lucky, I've got a Masters in Engineering, I think I can follow your arithmetic and grasp the scale of this. I simply pointed out that you're mixing up garbage with human waste with liquid human waste. You're mixing up total visitors to Yosemite with backcountry visitors and then combining it all in a blender. I think you nailed it when you wrote a horse impact is 4 times more than a human impact. Even that is hard to compare because the impacts are different - people don't crap on the trail (but they do leave wag bags around), people don't eat alpine grass, and people don't roll around in fragile meadows.
I'm not picking on horses, I like them. It's too bad the NPS needs to lose a lawsuit to get them to establish reasonable rules and limits which sets an even playing field. The packers will comply, and when they are all subject to the same rules, nobody is at a competitive disadvantage for going the extra mile to protect the environment.
Yes, well designed and maintained solar-powered backcountry toilets do evaporate human waste, both solid and liquid. Hunt around this board for more information - try "Solar Toilets vs Carrying Wag Bags" for a start.
