Chris Mooney

• Environment

A writer who covers climate change and the environment has had to learn more than most about air quality, how much it matters and how to preserve it. Here are his tips for making indoor air safer.

• Climate

A summer in which the Arctic Ocean features almost entirely open water could be coming even sooner than expected and may become a regular event within most of our lifetimes, a new study says.

• Climate Lab

These scenarios help show us what needs to be done — and what we can still do.

• Climate

Scientists studying one of Greenland’s largest glaciers say it is melting far faster than expected at its most vulnerable point, a worrying sign that glaciers perched in the ocean could contribute more rapidly to sea level rise than currently forecast.

• Climate

Multiple studies raise new questions about whether New Orleans, Miami, Houston and other coastal communities might be even more at risk from rising seas than once predicted.

• Environment

The Eurasian Ice Sheet retreated by 2,000 feet a day during the last ice age, a study finds. It may show how fast ice and glaciers in Greenland and Antarctica could melt and raise sea levels today.

• Climate

New research provides a startling look at how warmer oceans, driven by climate change, are tearing apart the Thwaites Glacier.

• Climate

The record is a sign that one of the most remote and mysterious facets of the climate system may, at last, be responding to the overall planetary warming trend.

• Climate & Environment

Scientists found a climate change disaster waiting to happen in one of the most mysterious regions on Earth.