The hordes of fish were killed by a red tide, a large "bloom" of toxic algae that appears on Florida's Gulf Coast about once a year. Experts say the bloom shouldn't be happening right now.

Active fires in northeastern Ontario and eastern Manitoba are expected to send smoke across northern Quebec today and Wednesday, Environment Canada said in a special air quality statement posted for each of the region’s 14 communities.

Wildfires on permafrost are ravaging Yakutia - or the Sakha Republic - the largest and coldest entity of the Russian Federation. The scale is mesmerizing. There are some 300 separate fires, now covering 12,140 square kilometers - but only around half of these are being tackled, because they pose a threat to people. The rest are burning unchecked.

Thunderstorms in Northern Alaska over sea ice on Monday sparked rare lightning strikes. The Washington Post reported lightning strikes occurred north of Prudhoe Bay, directly over sea ice, a rare phenomena that occurs once or twice a decade.

A bat in High Park tested positive for rabies on Wednesday, according to Toronto Public Health.

Climate change is keeping temperatures higher in the fall, setting up browntail-moth caterpillars to boom in summer. Their hairs are barbed and hollow and there’s a reservoir of a toxin inside.

The prospects are dim for this summer’s Norton Sound commercial fishing and crabbing seasons.