The LNT Principle is hereby amended to mean, Leave No Tarpaulin. Take your banners back with you. Better yet, do not have them printed. Tarpaulin is non-biodegradable and poses a threat to the environment and wildlife.
All mountaineers and so-called environmental climbers are also reminded to leave nothing but footprints. If your footprints look like cigarette butts, ChocNut and Magic Flakes wrappers, Royal-Tru-Orange and water plastic bottles, you have very weird feet indeed.
If you have a tendency to forget these basic rules, then stay home and pollute your own backyard. The mountains will thank you for it.