Traveling from the US to the UK without a passport

I'm a permanent resident if the U.S. (green card holder) in the middle of my application for citizenship. I haven't traveled since I was a young child where I was on my mother's Ethiopian passport.
I need to travel to the UK for work but do not have a passport and won't get one in time before the trip. Can I travel to the UK with just a green card?
Best Answer
If you are an Ethiopian citizen, then you will not be able to enter the UK without an Ethiopian passport, and you would have to apply for a UK visa. There will be no way you could get a visa to enter the UK with only a green card.
Unfortunately, you may have to postpone this work trip until you obtain your US passport.
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Answer 2
Yes, you need a passport. If you are unable to get an Ethiopian passport and are a refugee or asylee, you may be able to get a travel document from the United States to serve in its place. But the UK will not admit you with just a green card, so the airline won't let you get on the plane.
Answer 3
A Green card, on its own, is only valid for entering Canada by land, or re-entering the US.
So no, you will have to cancel the trip (don't forget to get the airport taxes refunded) unless you can get an emergency travel document.
And get a passport before your next trip. You need it.
Answer 4
If you have your ticket already, you may be able to expedite the passport application. This generally involves personally going into one of the passport centers (they are in select major cities). Information on how much you can expedite and under what conditions is available here: https://travel.state.gov/content/travel/en/passports/apply-renew-passport/hurry.html
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Ethan Wilkinson, Pixabay, Dominika Gregušová, nappy