I'm 61 yrs old.My older brother was a shooter,and he bought a lot of magazines.Field and Stream,Sports Afield,Outdoor Life,Amercan Rifleman,Gun Digest,etc.
He left behind about a pickup load when he went to serve in the mid 60's.
I read,re-read,and digested all of them,along with a few books he left,like Ruark's "Old Man and the Boy.
These magazines dated back to the late 50's.
I can tell you the old authors like Ted Trueblood,John Jobson,Richard Stearns,Havilah Babcock,and many more contributed to a sportsmans culture of ethic that was based on stewardship of the earth.
Sportsmen and women,and farmers and ranchers have had a conscious relationship with air,land,water and wildlife long before it became fashionable.
Another organization that did a lot for teaching environmental responsibility was Scouting.
I appreciate the OP's interest...I think you may find Sportsman are already on board.Read Ruark's "Old Man and the Boy"...talking about the quail as a gentleman's bird ..
I get my hackles up when responsible stewardship turns into a political elite using an ideology to gain control.
There is a tremendous difference between stewardship and control.
Now,what behaviors help? Tread lightly,pack it in,pack it out,if the road is muddy,chewing through in 4wd might not be best.Remember your hot catalytic converter.
All the same stuff that birdwatchers,river trippers,etc and other non-shooting outdoor activities also need to do.
Is the OP dancing around lead?Just asking.
Lead is one of the earth's elements.It has always been here.I used to live in Aurora,Ill.I delivered papers on Galena street.I could find ice cube size chunks of metallic galena in the landscaping of the yards as I delivered papers.
If lead in the ground is a problem,better shut down Aurora ,Ill,and Galena,Ill,evacuate the people,and make it a superfund site.
Oh,the water...well,out West in the Rockies,a lot of Silver was found.Lead is closely associated with silver.Yup,the Earth put lead in the ground way upstream near the continental divide.
I do not need the EPA to regulate lead out of my ammunition and sinkers.
Metallic lead in or on the ground is naturally found.