Response to Ozone Depletion vs Response to Global Warming By Mahia Rahman, age 16 First I urge you to compare these two sets of graphs In 1987 ozone levels dropped by 50%, and by the 1990s, scientists warned that by 2050 the ozone layer would collapse entirely. Considering the horrific consequences of ozone depletion, activists, scientists, and lawmakers worldwide proposed solutions. That same year, The United States and other big countries signed the Montreal Protocol, an international environmental treaty aimed at phasing out the production and consumption of substances that deplete the ozone layer by putting forth rules, guidelines, and preventative measures countries should take to slow ozone depletion. In the following years, every single country in the world signed the Montreal Protocol. Every country that signed the Montreal Protocol began phasing out the production and consumption of Ozone-depleting substances (ODSs) like hydrofluorocarbons and Halons. Soon after the Montre...