Easiest thing we can do as concerned individuals is to stop eating meat and dairy. Much of the deforestation happening across the world is due to farming animals and growing the incredible amount of food farm animals require.
We all need to do much more in addition to just not eating animals. Endless production, consumption and growth the way we’re currently doing it is just completely unsustainable.
Cutting your income is the easiest way to cut consumption.
It's only a principle if it hurts you to hold to it.
For nearly all of us, this can't compete with having a comfortable, secure life.