How did we save the ozone layer?

A UN report has found the Earth’s ozone layer is on course to be
healed within the next 40 years. What was once humanity’s most
feared environmental peril is now an example of how the world can
take collective action. Madeleine Finlay speaks to atmospheric
scientist Paul Newman about this momentous achievement and whether
it really is the end of the story. Help support our independent
journalism at theguardian.com/sciencepod