During the hot, humid summer months, meteorologists often discuss the heat index instead of the actual air temperature. But how is the heat index calculated, and why is it more important than the ...

Scientists have captured Earth’s climate over the last 485 million years. Here’s the surprising place we stand now. An effort to understand Earth’s past climates uncovered a history of wild ...

The planet’s average temperature shattered the previous September record by more than half a degree Celsius (0.9 degrees Fahrenheit), which is the largest monthly margin ever observed.