The flooding was caused by a deluge of swiftly melted snow.
Each of the last 10 months ranked as the world's hottest on record, compared with the same time in previous years.
The temperature jumped by 38.5C - a world record.
She was driven off in a police van.
Methane is a greenhouse gas that contributes to climate change.
Associate Education Minister David Seymour criticised the climate change marches, saying students should be in school.
About 100,000 school students marched in towns and cities across the country.
Here's the latest.
"It's not even a climate strike."
