Your "Green Card" is proof that you have been granted Lawful Permanent Resident (LPR) status, and may be used for re-entry into the U.S. after travel abroad. Relatively short trips abroad will have no impact on your ability to maintain LPR status, but extensive travel raises a risk that the USCIS will deem a person to have abandoned residence in the U.S. (and LPR status). Generally, a single trip abroad of six months to a year creates a (rebuttable) presumption of abandonment of LPR status, and a single absence of a year or longer creates a legal determination of abandonment of LPR status. In some circumstances, however, it is possible to avoid consequences from extensive travel, and if you need to travel extensively it would be helpful for you to get immigration legal advice specifically about that.
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David N. Soloway
Frazier, Soloway & Poorak, P.C.
1800 Century Place, Suite 100
Atlanta, Georgia 30345 www.fspklaw.com
404/320-7000 877-232-5352 email@example.com