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Greece wildfires: How climate change is involved, and what we can do about it

July 29, 2023
in Science
Greece wildfires: How climate change is involved, and what we can do about it
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by Matthew William Jones, Chantelle Burton, Douglas Kelley and Stefan H Doerr, The Conversation

Greece wildfires: how climate change is involved, and what we can do about it

Increases in extreme fire weather are set to continue without greater action to address climate change. Asterisks signal the level of global warming at which extreme fire weather is unprecedented, compared with the pre-industrial climate. Credit: Jones et al. (2022)

Fanned by strong winds and record temperatures, wildfires on the Greek island of Rhodes recently spread from the hilly interior to the densely populated coastline with astonishing speed, leaving authorities with the daunting task of evacuating thousands of residents and holidaymakers from harm’s way.

The role of climate change in heightening the risk of wildfires cannot be ignored. The world is, on average, 1.2°C warmer than in the pre-industrial climate, and this extra heat is bringing more frequent heatwaves and droughts. These weather conditions make the environment more fire-prone, and their increasing frequency has exposed already fire-susceptible regions such as the Mediterranean to greater risk of disaster.

Scientists use a fire weather index to estimate how flammable vegetation becomes under a set of weather conditions including temperature, humidity, wind speed and how recently rain fell. In the Mediterranean, the frequency of extreme values on this index has increased faster than virtually anywhere else on Earth since the late 20th century. As a result, the Mediterranean now faces 29 additional days of extreme fire weather a year.

Greece’s recent bout of extreme fire weather emerged from a heat wave that would have been at least 50 times less likely in the pre-industrial climate. Days with extreme fire weather are set to increase through to 2100 if emissions are not reduced.

Due to changes in the global climate, the UN Environment Programme predicts an increase in extreme wildfires of up to 14% by 2030 and 50% by 2100. Even at 1.5°C of warming (the threshold nations pledged to halt temperature rise to as part of the 2015 Paris Agreement), a 40% greater area is expected to burn in the Mediterranean.

Breaking down the causes of wildfires

When attributing the cause of a wildfire, it is important to distinguish between the factors that cause a fire to ignite and those that cause vegetation to become so dry that they are primed to burn. Climate change alone cannot ignite a fire—a spark from an ignition source or lightning is necessary.

Greece wildfires: how climate change is involved, and what we can do about it

Actions taken before, during and after a fire can reduce the prevalence and severity of wildfires. Credit: OECD, Author provided

Arsonists were blamed for starting at least some of the fires in Greece, although arson is actually a minor cause of wildfires in the country. Of the past Greek wildfires with a verified ignition cause, only 23% were caused by arson. Most arose from fires on farmland initially started to burn crop waste or encourage new growth of pasture grasses, or from fires on scrubland and grassland that were lit to manage unwanted vegetation.

With climate change providing more of the conditions that support fire, fresh opportunities are arising for people to start fires, whether on purpose or by accident.

The frequency of extreme fire weather will accelerate if global warming exceeds 2°C, but the world can still avoid the most severe outcomes by rapidly reducing emissions of greenhouse gases. It is not too late to stop burning the fossil fuels that are driving climate change and extreme weather.

The worst can still be avoided

Regions like the Mediterranean have naturally fire-prone landscapes, and it is unrealistic to expect people to exclude fire from their lives completely. Society must learn to adapt and live with fire while increasing preparations for more extreme fires in the future.

Wildfire budgets have historically prioritized fighting active fires. For example, in Greece, 92% of the national budget for forest fires was devoted to suppressing fires during the 2010s, with only 8% devoted to preventing them in the first place. As well as investing in firefighting teams and equipment, countries should develop better early-warning systems, evacuation plans, fire-resistant buildings, and computer models of fire behavior. Programs that make communities more aware of their role in fire safety, including stopping arson and accidental ignitions, are also critical.

In many parts of the Mediterranean, decades of rural land being abandoned have caused vegetation to grow more densely than in the past. This denser vegetation can mean more fuel for wildfires, promoting more intense burning. One option to keep this fuel in check is to use controlled burns during safe weather windows.

The wildfires in Greece are a stark reminder of the threat posed by climate change, and the costliness of missing international targets to reduce emissions. Decisive action to curb emissions, manage fuels on the landscape, and prepare communities can still lower the risks that fires will pose in future.

This article is republished from The Conversation under a Creative Commons license. Read the original article.The Conversation

Citation:
Greece wildfires: How climate change is involved, and what we can do about it (2023, July 29)
retrieved 29 July 2023
from https://phys.org/news/2023-07-greece-wildfires-climate-involved.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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