Jennifer Ludden

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As part of President Trump's executive order to review "job-killing regulations," the Environmental Protection Agency last month asked for the public's input on what to streamline or cut. It held a series of open-mic meetings and set up a website that has received more than 28,000 comments, many of which urge the agency not to roll back environmental protections.

Updated at 4:30 p.m. ET

Tens of thousands of demonstrators took to the streets Saturday in Washington, D.C., and cities across the globe, for the People's Climate March, demanding action on protecting the environment.

On a sweltering hot day in the nation's capital, protesters made their way down Pennsylvania Avenue chanting, singing and banging drums. Once they reached the White House, some staged a sit-in while others marched past carrying signs and shouting, "Shame, shame, shame."

Kevin Butt's job is to find cleaner ways to power Toyota. One of the hardest places to do that is at the automaker's sprawling plant in central Kentucky, a state where nearly 90 percent of electricity still comes from coal.

Butt points out a new engine assembly line, where a conveyor belt moves in a slow circle. He says it was specially designed with a more efficient motor. There are also enormous fans overhead and LED lights, all changes that save millions.