Translation of pollute in Spanish

One hour later people were starting to leave and we did not exactly understand why. We took another drink and I paid the bar man cash. Later it turned out that the change he gave me would be fake money.
I wish you would help me to improve my Spanish. I am studying law in Germany and I am trying to learn Spanish. I hope you can help me and I could help you to learn German. Have a great day.
On day two my wife and I took a tour to visit the Altiplano. The tour started a little boring, when we visited a few empty villages nearby which were all pretty much the same. Empty with very little people.