The encyclical letter Laudato Si is available here on the Vatican website.
168. Among positive experiences in this regard, we might mention, for example, the Basel Convention on hazardous wastes, with its system of reporting, standards and controls. There is also the binding Convention on international trade in endangered species of wild fauna and flora, which includes on-site visits for verifying effective compliance. Thanks to the Vienna Convention for the protection of the ozone layer and its implementation through the Montreal Protocol and amendments, the problem of the layer’s thinning seems to have entered a phase of resolution.
On that latter issue, as the ozone hole has widened over all of the Antarctic continent, we come to realize that resting on past accomplishments isn’t sufficient, and that due attention is needed even as we make good progress in some areas.