When I was a child our parents would take us out on nature walks where we'd see all kinds of wildlife. My dad would take photographs of whatever interested him, mother and we kids would pick wild flowers and then look them up in nature books. We'd paddle in streams, collect different types of leaves and other such stuff for the school nature table. Our teachers would also take us on nature walks once a week in good weather. We'd be told what kinds of things to look out for during the different seasons and then we'd have lessons about what we'd found and discuss the items.
Long before the loss of our natural areas of woodland etc. school nature walks we seriously down-graded and soon became "bring in 3 different leaves on Monday" rather than "we are going out to collect different leaves".
Some children had parents like mine who were interested in getting their children out of town at weekends and showing them the beauties of nature, some parents were not interested in such things at all and their children missed out a lot.
Now, all children miss out because, besides apathy on the part of some parent, there are few places to go. Many of the places I remember from childhood have been sold off to businesses and now have housing estates, brick works and many other changes.
I was born on a small estate comprising of 50 semi-detached houses with an unmade road, no room for cars to be parked beside the houses - but no-one had cars then. Surrounding that estate were fields, in every direction. We helped the farmer bring in the hay from one field, watched him taking the cows to another, saw his pig sty close to his farmhouse, were chases by his geese, walked though the narrow path in his corn field and helped another pick potatoes (and were paid 5 bob a day for doing so).
Every one of the fields that I remember close to home is now a housing estate with tarmac roads and each house with at least 2 cars on the drive.
People need houses, people need cars but they also need some freedom from urban sprawl and good fresh air away from traffic.
What has happened in most places is sad and will never be reversed. Today's children cannot imagine the difference in their childhood and ours, no matter how much we reminisce and tell them about it.