- I try to avoid buying new things for as long as possible. When I can, I repair what I own or buy used. Living in a small apartment provides some natural incentives to avoid buying too much stuff.
- I avoid eating meat, and when I do, try to eat Chicken or fish.
- I try to take short showers and don't flush the toilet if I only urinate (it took my wife a while to get used to this, but she came around after a bit).
- I avoid using paper towels and reuse aluminum foil and bags as often as possible (often, you can wipe off the aluminum foil and use it a second or third time).
Some of these may not make much of a difference.
I have not spent too much time thinking about this, so my reasoning may be faulty, but I will share it anyway:
I am more worried about deforestation and the rainforests and poaching than climate change.
I want to keep a healthy planet so that conscious beings, and especially humans, can continue enjoying it. Thus, there is a balance between enjoying life (e.g., traveling) and reducing emissions. It seems, as is often the case with difficult ethical questions, that finding balance is key.