Tackling alarming decline in nature requires 'safety net' of multiple, ambitious goals

The scientific advice comes at a critical time: The CBD recently announced that none of its 20 biodiversity targets for 2020, which were set in 2010, has been fully reached. Policymakers, scientists and other experts are now preparing for the next generation of biodiversity goals, which will be unveiled at the CBD's Convention of the Parties in 2021.

"To curb the many threats to our biological world, we need biodiversity targets that are distinct, manifold and appreciate different facets of biodiversity," Amy Zanne, associate professor of biological sciences at the George Washington University and a member of the international team of researchers who analyzed the new biodiversity goals, said. "Evolutionary diversity, for example, may be a harder concept to neatly portray in a simple biodiversity target but it is critical that we acknowledge that some species are evolutionarily distinct -- they hold a unique and irreplaceable position within the Tree of Life and their preservation should be prioritized."

On August 17, 2020, the CBD released a draft of their post-2020 biodiversity goals. The research team, which included more than 60 leading biodiversity experts from 26 countries, assessed the goals and asked a number of questions, including what scientific evidence supported them, how the goals reinforced or undermined each other, and whether one aspect of nature could serve as a shortcut for others. Their independent assessment was published today in the journal Science.

"We hope this is a useful tool in the CBD negotiations on a new strategy for nature and people," Sandra Díaz, a professor at the National University of Córdoba and lead author of the paper, said.

According to the researchers, member nations of the CBD should consider three critical points when setting new biodiversity goals:

• Goals based on a single facet, such as species or ecosystems in isolation, are risky. Multiple, intertwined goals containing different facets, such as genes, populations, species, deep evolutionary history, ecosystems and more, are needed because of nature's complexity.
• Goals should be defined and developed holistically rather than in isolation, with potential to advance multiple goals simultaneously and minimize trade-offs among them.
• Only the highest level of ambition in setting each goal, and implementing all goals in an integrated manner, will provide a realistic chance of stopping -- and beginning to reverse -- biodiversity loss by 2050.

"Building a sufficiently ambitious safety net for nature will be a major global challenge," Díaz said. "But unless we do it, we are leaving huge problems for every future generation."

The researchers note they explicitly focused on the biological aspects of the draft goals and did not evaluate the economic or political consequences. They say, however, that not considering social and political issues when implementing new goals would be a recipe for failure.

In the new paper, GW's Zanne urged that different kinds of diversity be considered when setting biodiversity targets, which is reflected in the paper's supplement under "Species extinctions -- risks, roles and history."