(CNN) The governments of 187 countries have agreed to control the movement of plastic waste between national borders, in an effort to curb the world's plastic crisis -- but the United States was not among them.

Nations agreed to add plastic to the Basel Convention, a treaty that regulates movement of hazardous materials from one country to another, in order to combat the dangerous effects of plastic pollution around the world.

The pact was approved at the end of a two-week meeting of UN-backed conventions in Geneva, Switzerland.

But the US was not involved in the decision-making process, as it is one of just two countries that have not ratified the agreement.

The resolution means contaminated and most mixes of plastic wastes will require prior consent from receiving countries before they are traded, with the exceptions of mixes of PE, PP and PET, according to WWF.

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