Indonesia is battling its worst wildfires in more than a decade, made worse by El Niño. Many were deliberately set to clear land for farming, including palm oil plantations. More than 12,000 schools across Indonesia have closed because of the toxic haze. Natanael Undas, a school principal and photographer, has been documenting the fires on social media.

It's been an intense hurricane season in the Pacific Ocean, with storms spawning in assembly-line fashion near Hawaii and Mexico as El Niño conditions worsened by global warming create unusual weather.