IB ESS SL 6.4.6 Ozone-depleting substances (ODSs) Question Bank

halons/CFCs/HCFCsHBFCs/ $\mathrm{N}_{2} \mathrm{O}$ /methyl bromide/methyl chloroform/carbon tetrachloride/ chlorine/bromine:

Note: do not credit HFCs/ODSs

a. Montreal Protocol resulted in unprecedented international cooperation to address loss of ozone (and its influence still continues);
b. banned use of CFCs/ phasing out of CFCs/ ozone depleting substances /refrigerants/aerosols/recycling of refrigerants;
c. alternatives to CFCs (HFCs/HCFCs) were developed reducing harm to ozone;
d. education/awareness campaigns led to changes in consumer preferences;
e. ozone reforms due to natural reversible chemical reactions/processes / ODSs eventually begin to break down/dissipate;