english: Consider, the single most successful international environmental effort of the 20th century, the Montreal Protocol, in which the nations of Earth banded together to protect the planet from the harmful effects of ozone-destroying chemicals used at that time in air conditioners, refrigerators and other cooling devices.
non_english: Uzmimo za primer najuspešniji međunarodni ekološki napor 20. veka, Montrealski protokol, u kome su se nacije sveta udružile da zaštite našu planetu od štetnih efekata hemikalija koje uništavaju ozonski omotač koji se u to vreme koristio u klima-uređajima, frižiderima i drugim uređajima za hlađenje.