Agree with this. It's hard but just do what you can. If fortunate enough, an EV, and a heat pump. Solar and or a battery. Apart from helping the environment (and I feel better about my excessive power use when it's mostly from solar), it's something physical to show the kids and talk about.

For nature, as kudra says, plant some veggies and herbs. Even in a city you can grow a lot in a small space, or balcony. With kids maintaining a veg plot is hard, but go simple and easy. Potatoes require very little maintenance, can be grown in sacks, and the kids get to dig them out the ground. Not a great time of year though, but you have time to plant some herbs or even grow some lettuce and other salad. Gives plenty of opportunities to discuss it all with kids, while hopefully helping your own mind as well.

Just do what things you can, whether that's growing a lettuce, or installing solar panels or replacing the car. Any action helps, even if it's just to help your own piece of mind.