Delete multiple environments at one time (while locked)

[adamwade]

I often will save as, then need to delete a bunch of test environments for a final set up.  Now you must unlock each environment and delete it one by one.  At least cameras can be deleted from the scene tree with a shift click.  Actually, since both cameras and environments get locked a bunch so they don't get messed with, can there be an delete function with a safety check box to delete them all without unlocking each one by one?!?!?