Brass is cheap. Remember, half the folks out there have IQs less than 100. I would not encourage anyone to do anything but attend to safety any where near the firing line.
Why is brass “bad for the environment”?
Brass is worth saving, but I wouldn’t suggest hopping around while someone is firing, trying to catch it out of the air. Generally when I go to the range with people, whoever is not shooting stands behind the shooter and just takes general notice of where the brass is going. When the range is cold, the person watching the brass picks up as much as he can. Obviously we miss some, but it’s better than having some goof with a trash-bag tripping around next to you.