This article discusses how limiting the use of certain chemicals called CFCs can help protect the ozone layer in the sky. They suggest using quotas to control CFCs, which could be a cost-effective and simple way to reduce their emissions. By switching to different chemicals, we might be able to cut down on 90% of the harmful CFCs released. They also explore other methods, like equipment changes, to decrease CFC use. Some industries may still use these controls, even when using new, more expensive chemicals. The Environmental Protection Agency is thinking about creating rules to restrict CFCs and similar substances in certain fields.