All 193 countries and territories represented in the UN will be bound by the agreement, which will now begin negotiations and be in place by 2024.
The goal is to get rid of all kinds of plastic rubbish.
Not only water bottles and straws floating around in the world's oceans, but also microplastics.
A crossroads
“We are at a historic crossroads where ambitious decisions taken today can prevent plastic pollution from leading to the collapse of our ecosystems.
By developing a legally binding global plastics agreement, our world leaders are paving the way for a cleaner and better future for both humans and the planet, ”says Gustaf Lind, Secretary General of the WWF, in a press release.
There are no details on what the agreement will contain yet, only a framework.
And the framework extends over the entire life cycle of plastic products - from how they are produced to how they are handled when thrown away.
Plastic is manufactured using oil and gas, among other things.
Support for countries
Inger Näslund, senior marine expert at WWF, praises it as "one of the most ambitious measures for the environment" since the 1989 decision to phase out substances that deplete the ozone layer.
"It is a big step forward and comes after four years of campaign work by WWF and many others," says Inger Näslund.
The agreement can contain both legally binding and voluntary clauses and must set objectives on a global scale.
Financial support for poorer countries, to help achieve the goals, is also on the table.