1) You can click edit and Move messages to your Junk folder. It doesn't remove them permanently – sorry. Your best bet is to Unsubscribe if they are commercial emails.
2) This is a general rule I use. It may help if you are bothered by commercial email and are looking to filter your inbox.
Log into Gmail. Filter messages that have "Unsubscribe" in the body, and label them as Junk. Also, go to the Inbox settings in Gmail and turn on Override Filters for important messages.