As summers have grown hotter, high temperatures inside trucks without air conditioning have also sickened postal carriers and others who deliver America’s packages. A few have died.
The landmark legislation also restricts single-use plastics. Because California’s economy is so big, experts say, the law could have far-reaching effects.
In an effort to cut down on plastic waste, packaging is taking on different forms that can be more easily recycled or that do away with plastic altogether.