Me and DH chose not to have children because of overpopulation. I do worry about my nieces and nephews though and what their futures will be like.
I also worry a great deal about all the animals, trees, plants etc. Humans seem to be wiping everything out. I can't help feeling without humans the planet would be so much better off.
We try to do our bit. We have both been vegetarian for over 30 years and are now almost vegan (we use oat milk, vegan cheese but still eat eggs). We do have a car but live somewhere where the bus service is pretty awful. We rarely fly. In fact I have only ever flown 10 times (5 return trips) in my 60 plus years.
I buy most of my clothes in charity shops and wear them until they literally fall apart. I then use them for dusters. I hardly ever buy clothes anyway.
I've stopped using shower gel and now use bar soap and use a shampoo bar.
Food wise we try not to buy things like fruit and veg packed in plastic. We buy loose whenever we can and if it has to go in a bag we use a paper one. A store has just opened near us when you take your own containers/bags and buy things like pulses, nuts, raisins, pasta, cereals etc
I do think that people should be having less children but honestly cannot see that happening. I am saddened and rather shocked by how many mn posters have large families. I thought family sizes were getting smaller but it seems not. In my road there are 10 families with children, 5 of them have 3 children, 1 has 4 children and the other 4 have 2 children. Some of them possibly could have more - one with 3 children whose youngest is 6 months have said they want at least 1 more!