As the world battles historic droughts, landscape-altering wildfires and deadly floods, a landmark report from global scientists says the window is rapidly closing to cut our reliance on fossil fuels and avoid catastrophic changes that would transform life as we know it.

The state-of-the-science report from the United Nations' Intergovernmental Panel on Climate Change says the world has rapidly warmed 1.1 degrees Celsius higher than pre-industrial levels, and is now careening toward 1.5 degrees — a critical threshold that world leaders agreed warming should remain below to avoid worsening impacts.

Only by making deep cuts to greenhouse gas emissions, while also removing carbon dioxide from the atmosphere, can we halt the precipitous trend.
"Bottom line is that we have zero years left to avoid dangerous climate change, because it's here," Michael E. Mann, a lead author of the IPCC's 2001 report, told CNN.