Want information on US green card renewal?
It can be confusing that permanent residency is permanent while a green card is not. Once permanent residency status is granted, it is generally permanent, save for extreme situations. However, the green card is an identification card and like many ID cards has an expiry date. Those who do not go through green card renewal (http://www.immigrationforms.com/green-card-form-i-90/) do not lose their status as permanent residents. However, they have a difficult time proving their status, which can be challenging in the workplace or in situations involving travel.