The time for talk has passed and the time to act is now, according to a new United Nations report on how to curb the worst consequences of climate change.

Rapid mitigation measures – reductions in fossil fuels and better building practices – are needed to avoid unsustainable global warming, according to the report.

In fact, the report says, without immediate and deep emission reductions across all sectors, limiting global warming to 1.5 degrees Celsius is “beyond reach.”