New study quantifies link between climate crisis, wildfires

WASHINGTON – In a first, US climate scientists have quantified the extent to which greenhouse gasses from the world's top fossil fuel companies have contributed to wildfires.

Their analysis, published Tuesday in Environmental Research Letters, found that carbon dioxide and methane emissions from the so-called "Big 88" firms were responsible for more than a third of the area scorched by forest blazes in western North America over the past 40 years.

First author Kristina Dahl, of the Union of Concerned Scientists (UCS), told AFP wildfires in the western United

States and southwestern Canada have been worsening for decades: they are burning more intensely, over longer seasons, covering larger areas and reaching higher elevations.

To date, the cost of rebuilding and increasing resilience has largely been footed by the general public, "so we wanted to better understand the role that fossil fuel industry emissions have had in altering the wildfire landscape," she said.

"We really wanted to put a spotlight on their role in that, so that they can be held accountable for their fair share of the cost."

- 'Atmospheric thirst' -

Using climate modeling, the team determined that emissions from the Big 88 – which includes ExxonMobil, BP, Chevron and Shell – were responsible for increasing global average temperatures by 0.9 degrees Fahrenheit (0.5 degrees Celsius) since the start of the 20th century, or roughly half of the observed warming.

For the purposes of this study, the authors included all emissions across the life cycle of fossil fuels – from extraction and flaring operations to refinement and use inside a vehicle, for example.