PBS News Weekend

After President Donald Trump pledged to withdraw from the Paris climate accord, a number of U.S. companies voiced their opposition, pledging to reduce their use of fossil fuels. In a show dedicated to "Peril and Promise," our series of reports on climate change, we'll look at the latest on those efforts and talk with Paula DiPerna, Special Advisor to the Carbon Disclosure Project, about how far those initiatives have come. Climate Central's John Upton also joins Hari Sreenivasan to discuss the effects of recent wildfires on air pollution in parts of California along with Idaho, Oregon and Washington state.