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Today's sealed and insulated houses mean indoor air is often more polluted than the air outside. Cigarette smoke, pet allergens, and fumes from cleaners are increasingly trapped inside, along with chemicals released from insulation, paint and carpeting. NPR's Jon Hamilton reports on what researchers know about indoor air quality.

The Nord Stream pipeline leak might be the single largest release of methane, a powerful greenhouse gas. Experts say it pales in comparison to ongoing methane emissions from the oil and gas industry.

A wide range of Latino communities in the United States are affected by climate-driven storms, floods, droughts and heat waves, and are leading the charge to address global warming.

The Adirondack Council detailed how the park has been impacted by climate change and what New York needs to do to prevent more damage.

It's an important indicator, but there's a lot it doesn't tell you.

The rules would lower emissions of mercury and other toxic pollutants that can harm brain development of young children and contribute to heart attacks and other health problems in adults.

Renee Montagne and Steve Inskeep read from listeners' letters, including comments on tourism in Antarctica; leg room and safety videos in the friendly skies; and the misidentification of Don Quixote's sidekick.

Activists want wealthy countries and investment institutions to address Vietnam's human rights record before they provide funds to the country to address climate change.

Activists want wealthy countries and investment institutions to address Vietnam's human rights record before they provide funds to the country to address climate change.

Officials and state-controlled media have launched a major campaign against the rally, comparing it to the uprising in Ukraine that led to the fall of that country's then pro-Russia president in 2013.