Chinstrap penguins are decreasing in numbers due to a lack of krill, their only food source.

From 1969 to 1988, 25,000 infants were born early each year as a result of hot weather, and with global warming pushing temperatures higher, more babies will be at risk for early birth.

Carbon dioxide and temperature need to increase in a constant ratio for plants to keep up with climate change.

The concentration of the greenhouse gas is now one-and-a-half times what it was before the Industrial Revolution, the World Meteorological Association says.

Warming temperatures threaten reindeer herding and the preservation of cultural artifacts in Mongolia.

Insulating tundra soil with snow increased the abundance of microbial species involved in carbon dioxide and methane release.

Four independent groups say the work overestimates the carbon-absorbing benefits of global forest restoration, but the authors insist their original estimates are accurate.

Signatories of the declaration say the need for governments to act on human-driven climate change is too urgent to stay silent.

The utility company PG&E has cut electricity to much of the Bay Area as a preventive measure.