It was a decade ago when California became the first state in the nation to ban single-use plastic bags, ushering in a wave of anti-plastic legislation from coast to coast. But in the years after California seemingly kicked its plastic grocery sack habit, material recovery facilities and environmental activists noticed a peculiar trend: Plastic bag waste by weight was increasing to unprecedented levels. … Plastic has been found everywhere scientists have looked: From the deepest oceanic trenches to the highest alpine peaks. Petroleum-based plastics do not biodegrade. Over time, they break down into smaller and smaller pieces — known as microplastics, microfibers and nanoplastics — and have been found in household dust, drinking water and human tissue and blood.