Ow do you evaluate the economics discourse of sustainability?

This an presentation not an essay so I need 500 words to read and answer this question.
I have order the same question but I was difficult to me to understand it even to change something on it
English is not my first language and I think that the teacher will knew that this is not my work because he knew my level
(so please I want it in a very simple way also in simple word).I will give some web site the teacher had posted in the lecture

Here it is, it may help you

Listen to Debal Deb interview here:

John C. V. Pezzey and Michael A. Toman (2002) The
Economics of Sustainability: A Review of Journal
January 2002 Discussion Paper 02-03

Also I will attach the one I had order it and it was so difficult
Best regards