You don't, you go on the streets, a poor homeless dude and beg for money like the rest of us!
Generally, the UK educational system is slightly ahead of the US, however the degrees are interchangeable.
The only two jobs I could find are: Ecology teacher and Ecologist. Career description of a Ecologist is in related links area..
no, it is actually easy to get one because you went to collage and it is hard to get a job without one... better jobs come with degrees
Other than teaching you could consider curriculum development, or professional training.
You can teach at international schools in countries where Spanish is offered. I went to International schools all my life in different countries in South America, and all my Spanish teachers (and any...