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After years of discussion, international negotiations on a global plastics treaty resume this week in Nairobi, Kenya, at the UN Environment Programme headquarters.

The third session of the UN Intergovernmental Negotiating Committee on Plastic Pollution will take place from today until Sunday November 19.

The committee’s goal is to develop a legally binding agreement, finalised in 2024, to address the full life cycle of plastics – including their production, design and disposal.

Involving 175 nations, the treaty aims to transform plastic waste management, paving the way for new technologies and industries.

The problem of plastic pollution is too big for any one nation to handle. That’s why we need a global approach. It’s worked before with the ozone layer and acid rain and it can work again with plastic.



Plastic waste treaty: expert Q&A on the promise of a global agreement to reduce pollution


How we repaired the ozone layer

At CSIRO I lead the Ending Plastic Waste Mission, which aims to change the way we make, use, recycle and dispose of plastic. Our work aligns with the aims of the proposed UN plastic treaty, so I have been following the negotiations closely.

Multilateral agreements have helped create significant change in the past. The Montreal Protocol shaped environmental and industrial landscapes globally. Enacted in 1987, the protocol’s objective was to phase out substances causing ozone depletion.

The protocol is widely recognised for its global ratification – everyone got on board. And countries continued to adhere to the changes. This ongoing work has not only contributed to the tangible recovery of the ozone layer, but also prevented millions of potential cases of skin cancers and cataracts.

The protocol also sparked chemical industry innovation. Industries had to transition away from ozone-depleting substances such as chlorofluorocarbons or CFCs to more environmentally friendly alternatives.

The earliest replacements – hydrofluorocarbons or HFCs – were quickly recognised as a potent greenhouse gas, resulting in the 2016 Kigali Amendment to the protocol to phase them out too and use climate-friendly alternatives. As a result of this global process, we now have safer chemicals for refrigeration and air conditioning.



Saving the ozone layer: why the Montreal Protocol worked


Global legislation can deliver real change

Clean air legislation is another example. Acid rain became a prominent environmental concern in the latter half of the 20th century. It happens when sulphur dioxide (SO₂) and nitrogen oxides are released into the atmosphere, typically from industrial processes and the burning of fossil fuels.

Once in the atmosphere, these pollutants react with water vapour to form sulphuric acid and nitric acid. As they fall to the ground mixed with rain or snow, the high acidity harms aquatic ecosystems, forests and even human-made structures.

In response, various countries enacted clean air legislation. For instance, the United States Clean Air Act of 1963, amended several times in the following decades, motivated change in industrial and automotive sectors.

The laws forced industries to transition to cleaner technologies and invest in advanced pollution-control equipment. This paved the way for a widespread adoption of catalytic converters and more fuel-efficient engines.



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How multilateral agreements can force change

Regulatory tools such as multilateral agreements introduce restrictions. Instead of doing business as usual, these restrictions then foster cleaner, more sustainable practices. They blend environmental responsibility with business imperatives. As a result, the regulatory changes open up new market opportunities.

Additionally, global collaborations driven by these agreements often encourage the transfer of technologies across borders. This speeds up the adoption of cleaner technologies.

Multilateral environmental agreements can drive technological progress and industrial innovation. By establishing high standards and fostering global collaboration, these agreements blend environmental stewardship with industrial evolution.



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Now for the UN plastic treaty

The global plastic treaty will address the pervasive challenge of plastic pollution, which affects our oceans, marine life and carbon footprint. It is expected to usher in transformative regulations on waste management, reduce the use of single-use plastics and advocate for the circular economy principles of eliminating waste and keeping materials circulating in use.

We are already seeing a shift in plastics manufacturing towards more sustainable, biodegradable, or recyclable plastics. Industries are developing more circular business models that emphasise the reuse and recycling of products and reducing waste.

To reduce single-use plastics, the packaging industry is transitioning towards reduction, reuse and recyclability. Advanced recycling technologies and better bio-derived plastics are expected to emerge as industry standards.

The multilateral treaty and its implementation will help to reduce problematic and unnecessary plastics. It will also speed up the removal of harmful chemicals from product supply chains.

The UN plastic treaty is set to be finalised in 2024. If we can get a global agreement on this, we have a real opportunity to significantly reduce plastic waste for a sustainable future.



Here’s how the new global treaty on plastic pollution can help solve this crisis


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