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    How damaged are coral reefs? I dive to investigate climate change

    Corals are, in many ways, the trees of the seas. They generate oxygen, provide habitats for animals and protect their environments from extreme weather. They also bring many benefits to humans, including creating livelihoods such as tourism.But bleaching and death are widespread as a result of higher ocean temperatures, low oxygen and increased carbon dioxide — all caused by climate change. Rising sea levels and more frequent extreme weather speeds up coastal erosion and the flow of minerals and nutrients into sea water, causing algal blooms that harm corals.I was captivated by the beauty of coral reefs when I went scuba diving for the first time on Phuket Island, Thailand, in 2016. In this picture from last year, I was collecting coral samples (which I do several times a year) at Kham Island in southern Thailand, to study how low oxygen levels affect them. Those levels, and the impacts of ocean acidification, are the subject of the PhD I’m doing at Prince of Songkla University. After I graduate, I hope to keep investigating corals so that I can help to better protect them and the marine environment.In a study published this year, my colleagues and I measured the effects of increasing the water temperature by 3 °C, lowering the oxygen content, or both, on the growth rates of three coral species. In most cases, growth slowed (T. Jain et al. J. Mar. Sci. Eng. 11, 403; 2023). Warmer water and low oxygen also mostly reduced the density of symbiotic algae in the coral and their ability to photosynthesize efficiently.Fishing and tourism can also harm corals, but we cannot just ban these pursuits, which provide important livelihoods. In the future, I hope that I and other scientists will be able to supply data on the consequences of various human activities, to be fed into models of coral stress and ocean health.Protecting ocean environments is a crucial job for everyone, not just those who live in coastal areas. More

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    Audio long read: These animals are racing towards extinction. A new home might be their last chance

    Download the 29 September Long Read podcastAustralia’s swamp tortoise is one of the most endangered species in the world. This species lives in wetlands that are under threat due to rising temperatures and a reduction in rainfall.In an effort to save the tortoise, researchers are trialling a controversial strategy called assisted migration. This approach has seen captive-bred tortoises released in other wetlands some 330 kilometres south of where they are naturally found. The aim is to see whether the animals can tolerate cooler climates, and whether this new habitat might ensure the species’ future as the planet warms.While many conservation biologists and land managers have long resisted the idea of assisted migration, attitudes are changing and other projects are beginning to test whether it can protect protect animals at risk from climate change.This is an audio version of our Feature: These animals are racing towards extinction. A new home might be their last chanceNever miss an episode. Subscribe to the Nature Podcast on Apple Podcasts, Google Podcasts, Spotify or your favourite podcast app. An RSS feed for Nature Podcast is available too. More

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    Measuring the ecological benefits of protected areas

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    The geography of climate governs biodiversity

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    Enrich urban biodiversity for sustainable cities

    Writing on behalf of participants in a workshop on conservation (see go.nature.com/48sfhkh), we are concerned that you overlook the crucial issue of urban biodiversity when making the case for sustainable cities (Nature 620, 697; 2023).
    Competing Interests
    The author declares no competing interests. More

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    World recommits to 2030 plan to save humanity — despite falling short so far

    World leaders this week vowed to redouble their efforts on an ambitious plan to end poverty and protect the environment, which is woefully behind schedule.None of the United Nations’ 17 Sustainable Development Goals (SDGs), outlined in 2015, will be met by the self-imposed 2030 deadline. Governments and leaders are better at making promises than at keeping them, scientists have told Nature. However, there are signs that the SDG agenda is having an impact, they say.A 12-page “political declaration”, approved during the UN SDG Summit in New York on 18 and 19 September, declares that the goals remain the world’s “overarching roadmap” for the future. “We will act with urgency to realize its vision as a plan of action for people, planet, prosperity, peace and partnership, leaving no one behind,” the agreement states.“The SDGs need a global rescue plan,” UN secretary-general António Guterres declared at the opening of the summit. Guterres is proposing to increase funding for sustainable development by at least US$500 billion to help countries to achieve the goals, as well as other financial aid, including debt relief for the poorest nations so they can survive and thrive after economic shocks.The political declaration arrives amid evidence and analysis suggesting that governments are falling well short of the goals.There is hope for the SDGs yetResearchers involved in the four-yearly Global Sustainable Development Report (GSDR) analysed 36 of the 169 detailed targets that accompany the overarching goals. Of these, the scientists found that the world is on track to achieve only two targets — those aimed at increasing access to the Internet and to mobile-phone networks.Twelve targets showed little or no progress. In some cases, such as food security, vaccine coverage and greenhouse-gas emissions, trends are going in the wrong direction. The research suggests that without further action and resources, the world will be unlikely to achieve the goals even by 2050, two decades late.Paula Caballero, the former Colombian diplomat who was instrumental in creating the SDGs’ framework, says that the world needs to take bold and transformational action now to accomplish the SDG agenda.At the same time, she says that 2030 should not be seen as a final ‘take-it-or-leave-it’ deadline. “Let’s not think that 2030 is an end goal,” says Caballero, who is now responsible for the Latin American activities of The Nature Conservancy, a conservation organization based in the United States. “It’s a milestone.”Sociologist Shirin Malekpour, one of the GSDR authors, agrees. “What needs to change is what we are doing, not the targets and the goals,” says Malekpour, who is at Monash University in Melbourne, Australia.Malekpour sees some hope in the political declaration, which says that countries will not only continue to integrate the SDGs into national policies, but also “develop national plans for transformative and accelerated action”.“If, outside of everything else, they just do this one thing, I think we will actually see huge progress,” she says.Focus on integrated actionFor Caballero, the SDG summit is also evidence that the goals are focusing minds on the integrated nature of the challenges facing humanity. But she says that the UN system is still making the mistake of treating sustainable development and climate as separate issues, including by holding separate SDG and climate summits in New York this week.“The only way you’re going to deliver on climate mitigation and adaptation is through the SDGs, and you can’t meet the SDGs unless you deal with climate,” she says.Although the Paris climate agreement and the SDGs were born of separate political processes in 2015, she says, the two agendas are in fact “one and the same”. More

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    Protecting peccaries, preserving a people’s knowledge

    Chaco Seco is the largest subtropical dry forest in South America. It has many trees, such as Prosopis alba, which bears a nutritious fruit, and Aspidosperma quebracho blanco, which produces a hard wood. The forest has cactus species and Bromelia plants, which are traditionally used to make a textile fibre for clothes and crafts.Project Quimilero is a non-profit group, created in 2015, that aims to protect Chacoan peccaries (Catagonus wagneri), a pig-like animal endemic to Chaco. We work with Indigenous and creole communities to preserve the region’s culture and biodiversity. We meet with the Indigenous Wichí people to record places, animals and plants that are important to them.In this picture from last April, I’m standing near the village of Nueva Población, Argentina, holding a map of the area that was drawn with the help of elder Wichí members. This exchange of knowledge was invaluable for our work. We now understand that the Western concept of ‘territory’, with its rigid boundaries, doesn’t make sense to these communities. Changes in seasons, soil-saturation levels and animal movements force these peoples to go beyond those boundaries to hunt and collect water.When I moved to Chaco in 2010, I realized that deforestation is a major threat to the biodiversity of plants and animals, and to the Indigenous communities. Chacoan peccaries cannot tolerate habitat loss. Our research has predicted they could become extinct in less than 30 years (M. Camino et al. Biodivers. Conserv. 31, 413–432; 2022). Deforestation is due to industrial agriculture and logging. Europe now forbids the import of deforestation products, a policy that could decrease this kind of destruction.More such initiatives are needed. I co-authored a study (M. Camino et al. Glob. Environ. Change 81, 102678; 2023) showing that there is less deforestation in the parts of Chaco Seco that Indigenous communities have the rights to than in other areas. More

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    Colombia considers ban on most research and education using live animals

    Several pieces of legislation that are under consideration in Colombia threaten to change the country’s research landscape if passed, by banning almost all science and education using live animals. Although one bill introduced in Colombia’s Chamber of Representatives has already been rescinded after backlash from scientists, a second bill and a constitutional amendment remain active in the Senate.“Science hasn’t always been supported by politicians in Colombia, but I don’t think any of us saw this coming,” says Nataly Castelblanco-Martínez, an aquatic-mammal biologist at the National Council for Science and Technology in Mexico, who is originally from Colombia and frequently collaborates with scientists back home. “No one is saying we don’t need regulation, but together, [these bills] affect virtually everything we do as researchers.”A rising movementColombia is one of the world’s most biodiverse countries. After a civil conflict that lasted more than 50 years and limited where scientists could travel, researchers resumed chronicling wildlife and establishing conservation plans. But there are many understudied species, and in recent years, an ‘animalist’ movement has developed in Colombia that threatens scientists’ work.
    Expeditions in post-war Colombia have found hundreds of new species. But rich ecosystems are now under threat
    The bill that has since been withdrawn from the Chamber of Representatives — which hosts a number of politicians who are sympathetic to animal-welfare causes — had stated that “in no case may wild animals be used in education or biological studies”. After scientists raised the alarm, at least four members of the Colombian Congress pulled their signatures. In an e-mail to Nature, the bill’s author, Juan Carlos Lozada Vargas, said that he ultimately withdrew it “to create a space of trust” with scientists. And he has been visiting researchers in various institutions since then.Some scientists say that ‘animalists’ are taking advantage of the closure earlier this year of a malaria research facility in Cali, which had been funded by the US National Institutes of Health, to push through more restrictive animal-research policies. The animal-welfare organization People for the Ethical Treatment of Animals (PETA) unearthed evidence of alleged animal abuse at the laboratory.At the same time, there’s an ongoing debate over how best to manage a population of invasive hippos accidentally introduced into Colombia after they escaped from the drug-cartel leader Pablo Escobar’s estate outside Medellín. The hippos, biologists say, threaten native species, and their population must be reduced. Others, however, are protective of the hippos and the benefits they bring through tourism. The Animal Legal Defense Fund, an organization that advocates for the rights of animals, filed a lawsuit against the government over its efforts to control the hippos, and Colombian senator Andrea Padilla Villarraga recently introduced a draft constitutional amendment that would recognize animals as people, with commensurate legal protections.Researchers note that granting personhood to something like an invasive species would be a dangerous precedent that ignores the damage a single species can do to an entire ecosystem. In an e-mail to Nature, Padilla Villarraga rejected this argument. “Does environmental protection conflict with the protection we owe to other animals as sentient individuals?” she asked. “It is a false dilemma to think that you have to choose between one and the other.”Research transformedPadilla Villarraga is also the author of the pending Senate bill that would curtail animal research and overhaul the country’s ethical-approval process. The bill states that “the use of live animals in academic and scientific research, toxicity-testing studies, biological or related studies” is prohibited when the results can be obtained “by other means” or when using “live animals of a higher grade on the zoological scale”. Scientists say that they take this to mean animals with greater cognitive capacity or sentience, but that the vagueness of the bill makes it challenging to interpret.

    Carlos Daniel Cadena Ordoñez handles a white-breasted wood wren (Henicorhina leucosticta) captured for research purposes using a mist net.Credit: Guillermo Gómez

    Carlos Daniel Cadena Ordoñez, the dean of the school of science at the University of the Andes in Bogotá, says that larger institutions in cities might be able to meet these new requirements, but that smaller, more rural ones probably won’t. “There are all these barriers to science, and now we’re going to put more barriers that are going to make it even more exclusionary,” he says.
    Landmark Colombian bird study repeated to right colonial-era wrongs
    Beyond the damage that the legislation would do to research, it would change the way in which students are educated. The bill states that undergraduate students cannot interact with animals until their last two years at university, and then only under supervision. “But all the research that I do, I do with students,” says Andrés Cuervo, an ornithologist at the National University of Colombia in Bogotá, who focuses on avian biodiversity. “We need to put these people out there in the field right away.”The Senate bill would also effectively shutter the conservation work of Ana María Morales, a wildlife biologist at the Eagles of the Andes Foundation, a bird-rehabilitation centre in Pereira. She observes endangered black-and-chestnut eagles (Spizaetus isidori), and sometimes captures and tags them. Animals that cannot be released are used to educate the public and to train professionals on proper handling techniques. “As the only raptor rehabilitation centre in Colombia, we are the ones that have this information, and this bill will prevent us from sharing it,” she says.A tense waitThe likelihood of the bill passing remains unclear. Cuervo says that it has a good chance of making its way to President Gustavo Petro, and that it could be signed by the end of the year. But others, including Cadena Ordoñez, think it’s unlikely to pass, given the reaction to the withdrawn Chamber of Representatives bill. However, “we have to act as though it will, because a lot of people will be out of work if this bill goes through,” he says.The threat has prompted Colombian scientists to organize. What began as a WhatsApp chat among concerned biologists has grown into a group called Biodiversos that currently has more than 2,750 members. Castelblanco-Martínez, who is a member, says that the group has been largely reactive — putting out statements in opposition to the bills — but that is changing: members recently attended a forum with Padilla Villarraga to outline their concerns. “The fact that we’re coming together, all working towards the conservation of our resources, it’s really great,” she says. More