Cassandra Profita

Darren Arnold lights the burners on a natural gas stove at a testing facility near Portland, Ore. He's using a new, lower-carbon gas mixture for NW Natural, a gas utility that serves 770,000 customers across the region.

"For a cooktop burner, we're looking for a nice blue flame, nice little peaks on the tips of the flame," he says. "So everything looks really good. We'll also check the oven."

Letty Martinez, Shiny Flanary and Xochitl Garnica spent the spring and summer taming weeds and planting crops on their new 2-acre urban farming collective, which offers free produce to low-income customers. Now, they're hoping to add a greenhouse and lighting powered by solar panels.

"We're really off the grid," Garnica says. "So, all of that will really help us a lot, so we can help the community that really needs fresh produce."

In another first-in-the-nation move to tackle climate change, California will require automakers to sell more electric trucks starting in 2024. The measure, approved unanimously Thursday by the California Air Resources Board, says that by 2045 all new trucks sold in the state should be zero-emissions.