New York is one of the world's most cosmopolitan cities and it is arguably the most diverse linguistically.

At least 800 languages from around the world are spoken in the city, making it a thriving centre of ethnic vibrancy and cultural diversity.

But some of those languages are in danger of being lost.

Al Jazeera's Kristen Saloomey takes a look at how some people are working to prevent that.

Air date: May 16, 2010