NAE list of engineering challenges...which ones are the top?

Question

Which engineering challenges do you see as the top or most important in the years ahead?

http://www8.nationalacademies.org/onpinews/newsitem.aspx?RecordID=02152008

Affordable solar energy....thin cell technology?

Reverse-engineering the human brain?

Converting waste products into energy via plasma-gasification?

Any others you would add to the list?

Answer 1

Ozonisation instead of Chlorination for Oxidation process / Colour removing / Disinfection.