Earth's ozone layer, once damaged with holes created by harmful chemicals, is on track to heal completely in mere decades, marking a huge victory in addressing climate change.

Susan Solomon, professor of environmental studies at MIT, said on Greater Boston that it took international cooperation to curb the use of chemicals such as chlorofluorocarbons, but it is paying off.

"We're already seeing signs of recovery — and that's the best we can do at this point, there's no removing those chemicals once they're already in the atmosphere," Solomon said.

Solomon said the international agreement to phase out the chemicals just "keeps on giving," as countries are also working to remove other greenhouse gases that contribute to global warming.

"We're all quite amazed by the progress that's been made," Solomon said, adding that there is still work to be done. The main contributer to climate change is carbon dioxide emissions from burning fossil fuels.

Watch: Climate victory: The ozone layer is on track to recover completely