Press releases - Deforestation and grassland conversion are the biggest causes of biodiversity loss
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Press Release, 10. November 2022
Deforestation and grassland conversion are the biggest causes of biodiversity loss
Researchers rank the main drivers of global biodiversity loss
The conversion of natural forests and grasslands to intensive agriculture and livestock is the biggest cause of global biodiversity loss. The next biggest drivers are the exploitation of wildlife through fishing, logging, trade and hunting - and then pollution. Climate change ranks fourth on land so far but second in oceans. This is the main result of an international study led by researchers from Universidad Nacional de Córdoba (UNC) in Argentina, Helmholtz Centre for Environmental Research (UFZ), German Centre for Integrative Biodiversity Research (iDiv) and the Natural History Museum London. The study, published in Science Advances, demonstrates that fighting climate change alone will not be enough to prevent the further loss of biodiversity.
Deforestation in a tropical rainforest to make way for palm oil plantations
Photo: Adobe stock / whitcomberd
Whilst climate change has rightly attracted attention for its catastrophic consequences for the natural world, it is currently only the fourth largest driver of biodiversity loss on land, followed by invasive alien species in fifth place. "This major new study, published during the COP27 climate summit, demonstrates clearly that fighting climate change alone will not be enough to prevent the further loss of biodiversity, and with it our future", says Dr Nicolas Titeux, one of the two first authors. "The various direct drivers should be addressed with similar ambition as the climate crisis and as a whole." Titeux currently works at the Luxembourg Institute of Science and Technology but conducted the major part of the study at the UFZ with funding from iDiv.
Greenhouse gasses have been known to be the leading cause of the climate crisis for decades but just as important is understanding what is behind the enormous and rapid decline in species. A million species of animal and plant are threatened with extinction within the next few decades without significant countermeasures. Ecosystems worldwide are changing away from their natural condition, which means that they are increasingly unable to provide crucial ecosystem services for human well-being. 
The authors of the study, led by Dr Pedro Jaureguiberry from UNC in Argentina and Dr Nicolas Titeux, also found that climate change is already in second place as a direct driver of species loss in the oceans. Here, the exploitation of fish stocks plays the biggest role. However, based on current developments, the authors assume that the importance of climate change for species loss and the decline of ecosystem services will increase in the coming years and decades and move up in the ranking of direct drivers.
The authors of this study thus confirm and specify the facts that the Global Assessment of the World Biodiversity Council IPBES had already indicated in 2019. "Our publication shows the depth of the work, which was performed in the Global Assessment of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES), where only the main results could be shown", says Josef Settele from UFZ and Co-chair of the Global Assessment of IPBES. "It indicates the profoundness of the IPBES work". 
Need for nature-based solutions
This major study should be a game-changer for understanding how to tackle biodiversity loss. Jaureguiberry says: "Our study brings comprehensive and rigorous information on which drivers cause the most damage to biodiversity at multiple levels, from regions and realms to the different facets of biodiversity, highlighting the importance of each driver in particular contexts. Hopefully, this will contribute to a more holistic approach to generate more efficient policies to reverse biodiversity loss."
In particular, the research demonstrates the need for a more holistic approach that will tackle the twin threats of climate and the biodiversity crisis together. Titeux points out that "The current global agreements such as the Convention on Biological Diversity (CBD) and the UN Framework Convention on Climate Change (UNFCCC) can focus too narrowly on one driver, overlooking or, in the worst-case, undermining solutions for others". 
Professor Andy Purvis from the Natural History Museum in London explains: "Climate change and biodiversity loss have been tackled largely separately, by different policies that haven't always considered the other problem. For example, biofuels are proposed as one way to get to net zero, but the expansion of plantations into natural forest that could result would be terrible for nature." 
The paper also highlights some of the 'nature-positive’ solutions that tackle both climate change and biodiversity loss such as large-scale restoration of natural forests and effective protection of coastal wetlands.
Andy Purvis adds:" I’d love for 'nature-positive' to get into the public consciousness as much as 'net zero' has. If future generations are going to have the same birth right we had of a liveable, supportive planet, then all parts of society will have to transition as quickly as possible to being both net zero and nature-positive." (Source: media release by Natural History Museum London)
The research was financed inter alia by the Deutsche Forschungsgemeinschaft (DFG; FZT-118).
Publication:
Pedro Jaureguiberry, Nicolas Titeux, Martin Wiemers, Diana E. Bowler, Luca Coscieme, Abigail S. Golden, Carlos A. Guerra, Ute Jacob, Yasuo Takahashi, Josef Settele, Sandra Díaz, Zsolt Molnár, Andy Purvis (2022): The direct drivers of recent global anthropogenic biodiversity loss. Science Advances, DOI: 10.1126/sciadv.abm9982 https://doi.org/10.1126/sciadv.abm9982
Further information
Prof. Dr. Josef Settele
Head of UFZ Department Conservation Biology & Social-Ecological Systems / iDiv / MLU
josef.settele@ufz.de
Dr. Nicolas Titeux
Luxembourg Institute of Science and Technology (LIST)
nicolas.titeux@list.lu
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In the Helmholtz Centre for Environmental Research (UFZ), scientists conduct research into the causes and consequences of far-reaching environmental changes. Their areas of study cover water resources, ecosystems of the future, environmental technologies and biotechnologies, the effects of chemicals in the environment, modelling and social-scientific issues. The UFZ employs more than 1,100 staff at its sites in Leipzig, Halle and Magdeburg. It is funded by the Federal Government, Saxony and Saxony-Anhalt.
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The Helmholtz Association contributes to solving major challenges facing society, science and the economy with top scientific achievements in six research fields: Energy; Earth and Environment; Health; Key Technologies; Matter; and Aeronautics, Space and Transport. With some 39,000 employees in 19 research centres, the Helmholtz Association is Germany’s largest scientific organisation.
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