If the headlines don’t already feel rather apocalyptic, they are about to get worse. On Monday, the U.N.’s Intergovernmental Panel on Climate Change (IPCC) will release the first part of its latest major assessment report after an eight-year gap. Over the past week, hundreds of climate scientists commissioned by the IPCC’s 195 member countries have been meeting virtually to run through their findings line by line to finalize the document, which will offer the most comprehensive reading yet of the physical science behind a warming planet and its changing climate.

In 2013, the IPCC’s assessment concluded that humans were the “dominant cause” of global warming since the 1950s. Its findings spurred the negotiations that led to the 2015 Paris agreement, which compels signatory governments to commit to reforms that will restrict planetary warming this century to under 2 degrees Celsius, and ideally 1.5 degrees Celsius. In the intervening years, the IPCC has issued a number of special reports, including analyses of the state of the oceans and the planet’s frozen corners, land use and phenomena like desertification, and a 2018 red alert over the rapidly narrowing window for governments, civil society and the private sector to push through drastic reforms that could stave off global temperatures rising at an average above 1.5 degrees Celsius.

The conclusions of the latest study — delayed for months by the coronavirus pandemic — are expected to sound an even grimmer warning about the pace of planetary warming. It is likely to offer a projection of how much more emissions can enter the atmosphere before that 1.5-degree threshold is crossed, a point beyond which experts warn of catastrophic events facing the planet. The assessment will also project with greater specificity what some of these disastrous effects may be.

“The report will cover not only the fact that we are smashing record after record in terms of climate change impacts, but show that the world today is in uncharted territory in terms of sea level rise and ice cover,” climate scientist Kelly Levin told Reuters. Levin added that the report “will underscore the urgency for governments to ramp up climate action.”

This was readily apparent even without the IPCC’s conclusions. Extreme weather linked to climate change has wreaked havoc across the globe in recent weeks. After torrential rains led to floods across areas of Northern Europe, wildfires are burning their way through parts of Southern Europe. In Italy, the number of these blazes is estimated to have tripled this year compared with the yearly summer average. In Greece, fires prompted evacuations around the archaeological site of the original home of the Olympics.