The US bans soaps, bodywashes, and toothpastes containing a harmful ingredient

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The US just approved a bill banning soaps, toothpastes, and bodywashes that contain tiny plastic particles called microbeads.

Earlier in December, the House of Representatives passed a bill phasing out the environmentally harmful beads beginning July 1, 2017. On Monday, President Barack Obama signed it into law.

The problem with microbeads is simple: They don't dissolve, instead entering water streams by the billions.

The California State Assembly approved a measure to ban the beads, which are touted by big companies as skin exfoliators, this summer.

In New York state alone, 19 tons of microbeads are washed down the drain each year, according to the Wildlife Conservation Society, where they collect harmful pollutants like DDT. In waterways, fish and other wildlife mistake the tiny scraps of plastic for food. From there, the beads are integrated into the food chain.

"Microbeads are highly damaging to the natural environment and the wildlife that live there," the Wildlife Conservation Society says in a press release. "Because natural alternatives already exist, a ban on their use in personal care products makes perfect sense."

A 2013 study found as many as 1.7 million of the tiny plastic particles per square kilometer in Lake Erie, one of the bodies of water in the Great Lakes region where much of our debris ends up.

Because they're so small, microbeads don't get filtered out by wastewater treatment plants. Instead they are discharged directly into rivers, lakes, and the ocean.

Fish, turtles, and other aquatic wildlife then feed on the tiny bits of plastic, which to them are often indistinguishable from food. But rather than simply getting eaten and discharged by the animals, the microbeads become lodged in the animals' stomachs or intestines. When this happens, the animals often stop eating and die of starvation or suffer other health problems.

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"We have the evidence that the micro plastics do cause harm," Marcus Eriksen, executive director of the 5 Gyres Institute, a research group that led the 2013 study, told Scientific American. "I am hoping we can translate that research into some positive action."

Johnson & Johnson, Unilever, and Procter & Gamble have all made pledges to phase out the most common kind of microbead from products.

The International Campaign Against Microbeads in Cosmetics has compiled a helpful list of the products that most likely contain microbeads.

Here are the products:

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