This week on Green Street, Patti and Doug talk about the role of nitrous oxide in climate change (it’s a greenhouse gas that’s 300 times more powerful than CO2 ), and how the world is beginning to realize that plastic is a toxic substance, just in time for the UN worldwide plastic treaty talks in South Korea. Then Dr. Charlene Elliot from the University of Calgary talks about the many ways in which food is marketed to children in every stage of their lives, and how helping them understand how they are being targeted may be more effective than regulation.