As a U.S. permanent resident, your need for a visa to visit Portugal (or any other Schengen Area country) will depend on your country of citizenship. The Schengen Agreement, which established the Schengen Area, allows for visa-free travel for citizens of certain countries, including U.S. citizens.
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Yes, you can travel abroad as a U.S. green card holder. This is one of the multiple benefits of having a permanent residency status. However, your trip needs to be temporary and requires specific documents to ensure that you can return after that.
In the case of a Green Card holder, your nationality, i.e., the country of your passport, will determine if you need a Schengen Visa to Portugal or not. So if you're a US Green Card Holder with a nationality that does not qualify for visa-free travel (like India), you'll need to apply for a Portuguese Schengen Visa.
Currently, there are about 38 VISA-FREE countries for US green card holders. A US green card is a pathway to a US passport. While you wait for your US passport, your US green card is already making your current passport strong.
Of the 27 EU member states, 23 participate in the Schengen Area. Of the four EU members that are not part of the Schengen Area, three—Bulgaria, Cyprus and Romania—are legally obligated to join the area in the future; Ireland maintains an opt-out, and instead operates its own visa policy.
The reason Ireland gave for not joining the other EU states in forming the Schengen zone in 1985 was the existence of the CTA with the UK, which would have disappeared if Ireland joined Schengen and the UK did not.
Customers must either hold a US visa or a permanent residence card (also known as a green card) valid for at least six months. The 14-day UAE visa on arrival costs AED 120. If needed, the visa can be extended once for an additional 14 days for AED 250.