Axios

Antarctica is missing over 1 million square miles of floating sea ice, even though it's currently the dead of winter in the Southern Hemisphere.

Why it matters: Scientists don't know what is driving the shortfall, but they are deeply concerned about its consequences, as sea ice influences the planet's climate, global ocean currents and marine ecosystems.

Phoenix endured its 31st straight day of temperatures of at least 110°F Sunday, as a California wildfire spread into Nevada and another blaze threatened border communities in Washington state and Canada.

Driving the news: The UN's World Meteorological Organization notes climate change has "spurred a surge" in extreme weather reports — including Canada's historic wildfires and the dangerous, ongoing record heat wave in the U.S. and other countries.