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Scientists said the concentration of carbon dioxide, which contributes to climate change, is the highest in data going back 800,000 years, based on ice core records.

The fire raging in Northern California was whipped up by high temperatures and strong winds. It incinerated much of the Gold Rush-era community of Greenville earlier this week.

Officials say Northern California’s Dixie Fire grew by 110 square miles between Thursday night and Friday morning, making the blaze the largest wildfire currently raging in the country.

The New Humanitarian has compiled its list of the conflicts, disasters and threats to watch this year. Editor Josephine Schmidt discusses how they came up with the list.

Authorities have reopened nearly all lanes of a major Southern California highway as firefighters made progress on a wildfire that jumped across the road.

Climate change is hitting many developing countries hard. In Uganda, one climate activist worries that the upcoming international climate talks won't protect her home.

The head of the United Nations says a “leadership gap” is undermining the world's efforts to curb global warming.

Authorities say four famous giant sequoias were not harmed by a wildfire that reached the edge of Giant Forest in California’s Sequoia National Park.

Tourists flock to the coastal town of Mendocino, California, for its Victorian homes and cliff trails. But visitors now are also finding portable bathrooms on the streets and dozens of signs on picket fences pleading with them to save water.

States that rely on the Colorado River for their water supplies are currently unable to finish a series of agreements that would keep its biggest reservoirs, Lake Mead and Lake Powell, from dropping to levels not seen since they were filled decades ago.