like ogown and nirt -- ozone and produce. >> reporter: what does it take way from the experiment? >> the chemical and the rehabilitation pathway is not responsible for forming the ozone in smog. >> reporter: when you finish future? >> i'm not sure. i have a good three years to go. it would be great to stay in the academic realm and do the research that i'm doing now. i think it would be interesting to bring what i have learnt about the scenes back into helping shape policies that can improve air quality in the u.s. and around the world. >> so just to clarify, we should not cut down trees, right >>> absolutely, he just showed how trees were part of this, and when human pollutants gets in the air, mixes with the trees and we get smog. it was fascinating. >> we used to do a through the of theoretical research. what is next for kelvin? >>> i'm convinced he'll run the e.p.a. what god to meet some interesting people. >> i met two guys trying to understand the power of water that shapes the landscape. lab. >> reporter: at cal terk jess studies how rocks and gravel cause grain in lab expe