Experts are still figuring out what exactly is behind the spike, but there is wide consensus that both El Niño...

The oceanic phenomenon could lead to more pathogen-carrying mosquitoes, bacteria and toxic algae.

Unseasonably early blooms can wreak havoc on allergies, disease vectors and agriculture.

This story was originally published by Grist. You can subscribe to its weekly newsletter here. By Zoya Teirstein, Grist Climate change is generating...