Is there a way to protect my kids from climbing up shelves?

Yes. Shelving and furniture should be stable on its own. Televisions, books, electrical appliances, etc. Should be secured or placed beyond their if possible. Furniture placed against the wall can often be secured to the wall with "l-brackets" available at most hardware stores. More information is available here: http://www.Cpsc.Gov/cpscpub/prerel/prhtml09/09345.Html.