Don’t have children is probably the single biggest thing you can do to reduce your future impact on the Earth
You can have a much bigger effect by getting rid of OTHER people.
Limiting your own consumption is completely counter-productive, as it leaves the resources to be consumed by those who do not share the same worries. They will simply have more resource available to increase their number and influence. (It's similar to those worrying about overpopulation and deciding to not having children : it's simply making sure the genes of those worrying won't make it to the next generation.)
In a non-policed commons situation, the only time it makes sense to try to shame people into consuming less is if they are your competition and you want to get rid of them.
The future belongs to whoever shows up for it. Here are the current likely winners: https://population.un.org/wpp/Publications/Files/WPP2012_HIG...
Edit: looks like we've had to give you a bunch of warnings already. If you'd please review https://news.ycombinator.com/newsguidelines.html and take the spirit of this site more to heart, we'd really appreciate it.
That said I will happily review the rules page again, I didn't intentionally violate it.