Thank you for being a better human by cleaning other people's trash. I did a quick google search to see if the tree can be saved. From what I have read, the tree has suffered way too much damage and will likely die. If it was a small section, there may have been a hope to place the bark back after cleaning the area, but sadly this isn't the case. If this is a protected areas, maybe contact those in charge of it and let them know about the vandalism. This shouldn't be allowed to continue.