Step 7 Laws! Laws!

Change takes time, but with persistence the world gets on board. Since 1987, 180 countries have signed on to an international environmental treaty called the Montreal Protocol. The treaty calls for the elimination of ozone-depleting substances like CFCs.

This game may be over but the CFC problem is not, and the biggest step of all is the next step.

What are you going to do to keep walking in Susan Solomon’s shoes? You could use chemistry to help protect the planet.