"As climate-related losses rapidly mount, global demands for climate justice will only grow," one expert said.

While fires rage and temperatures in Western Europe top the charts, the U.K.'s Met Office announced the first-ever red warning for extreme heat expected in the coming days.

"The findings of the Commission on Human Rights are a vindication for the millions of people whose fundamental rights are being impacted by the corporations behind the climate crisis."

"If we continue with fossil fuels, then we're... not gonna have a planet that we can live on," said one protestor who locked himself to an oil tanker.

Ten countries set or matched national monthly high temperature marks last year.

"None of this is normal," said Colorado state Rep. Leslie Herod. "We are not OK."

"This is your climate on fossil fuel."

"Today's bombshell report from the International Energy Agency is easy to translate," said Bill McKibben. "Anyone who continues to engage or invest in fossil fuel development is wrecking the climate."