The ozone hole fluctuates in size every year due to natural meteorological variations, but no shrinking trend can yet be seen. However, scientists are confident the Montreal Protocol is working in the long-term, and could be used to limit super pollutants that contribute to global warming.
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The International Civil Aviation Organization (ICAO) approved a road map for establishing a ceiling on aviation emissions in 2020. Reaching a successful agreement, however, will require a renewed commitment to action by the United States.