Negotiations in Bonn Will Likely Decide if Paris Climate Talks 'Can Save Human Civilization From Ultimate Collapse'
The text of the agreement on how the world will tackle climate change and set targets that will keep global temperatures from rising more than 2°C above pre-industrial levels is being negotiated in Bonn this week.
— The Climate Group (@ClimateGroup) June 1, 2015
The 2°C limit has been set by politicians to prevent the planet overheating dangerously—but the cuts in carbon emissions required to achieve it have so far not been agreed.
It is this gap between the policy goals agreed by world leaders and their lack of action to achieve them that the Bonn conference seeks to address.
The meeting, which opened today, will last for 10 days as working groups grapple with action to reduce carbon emissions, how to finance technology transfer, and how to adapt to sea level rise and other unavoidable consequences of present warming—such as the current heatwave affecting India, where temperatures in some southern states have topped 47°C.
Scientists and environmental groups have said that this year’s negotiations are humanity’s “Last Chance Saloon.” If steep emissions cuts are not agreed upon and implemented quickly, the global temperature has little chance of staying under 2°C—with devastating consequences for the natural world and human civilization.
There are signs that momentum towards agreement is increasing. A report by Globe International, which will be given to delegates, reveals that three-quarters of the world’s annual emissions of greenhouse gases are now limited by national targets.
The 2015 Global Climate Legislation Study shows that the number of climate laws and policies aimed at limiting emissions passed by national governments had increased to 804 this year, up from 426 in 2009 when the Copenhagen climate talks collapsed, and from just 54 in 1997 when the Kyoto Protocol was agreed.
The lead author of the study, Michal Nachmany, a researcher at the Grantham Research Institute on Climate Change, says: “With three-quarters of the world’s greenhouse gas emissions now covered by national targets, we can be more confident about the credibility of the pledges that countries will make ahead of the crucial summit in Paris.
“While collectively these pledges are unlikely to be consistent with the international goal of avoiding global warming of more than 2°C, the existence of national legislation and policies should provide the opportunity for countries to strengthen the ambition of their emissions cuts after the summit.”
Professor Samuel Fankhauser, co-director of the Grantham Institute and co-author of the study, says: “Every five or so years, the number of climate laws and policies across the world has doubled. This growing amount of legislation provides evidence that the world’s major emitters are taking serious steps to tackle climate change in their countries.
“By writing their intentions into law, the world’s leaders have shown that international climate change talks do lead to national action in the vast majority of countries.”
The problem is, as the report points out, that current targets and timetables to achieve them are not enough to limit greenhouse gases sufficiently to get below the agreed 2°C limit.
However, politicians are coming under pressure to improve their pledges. Ahead of the Bonn meeting, a business summit in Paris showed that many companies are pushing their political leaders for action.
— IUCN (@IUCN) June 1, 2015
This is a marked change from the last two decades, a time when the fossil fuel industry has lobbied to slow decisions on tackling climate change.
In Paris, 25 worldwide business networks—representing 6.5 million companies from 130 countries—demanded political action to achieve a low-emission, climate-resilient economy.
Christiana Figueres, executive secretary of the UN Framework Convention on Climate Change, the organizer of the Bonn conference, says: “With some 200 days to the UN climate convention conference in Paris, the growing momentum for change and for action is rapidly gaining ground across countries, companies, cities and citizens.
“News of yet another group of stakeholders committing to long-term emission reduction targets or ambitious investments in renewable energies is emerging almost daily—building confidence and a sense of ‘can do’ among nations as we enter the final six months of 2015.”
Whether this optimism is justified will be seen in the next week as the working groups refine the technical agreements that heads of governments are expected to sign in Paris in December.
Among the many recurring problems that have created a stumbling block is the amount of money pledged by rich nations to developing countries to help them avoid fossil fuel use and adapt to climate change. So far, the pledges to provide billions of dollars in technical help and adaptation have not been followed by the cash.
As well as trying to seal an agreement for action after 2020, the Bonn conference is also working to accelerate action in the five years until then—which are currently covered by no legally-binding international agreement. The particular focus here will be on scaling up the use of renewable energy and energy efficiency in urban areas.
The fact that China and the U.S. are now working together to reach an agreement in Paris is also helping move the talks along.
However, some developing countries, notably India, are still saying their priority is lifting their poor out of poverty, rather than reducing their emissions.
To this end, India is exploiting far more of its coal reserves, and jeopardizing hopes of global reductions in emissions.
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When Looking Through a Microscope Isn’t Close Enough.<p>For the last few years, <a href="http://www.rokaslab.org/" target="_blank">our team at Vanderbilt University</a>, <a href="https://www.researchgate.net/lab/Gustavo-Goldman-Lab" target="_blank">Gustavo Goldman's team at São Paulo University in Brazil</a> and many other collaborators around the world have been collecting samples of fungi from patients infected with different species of <em>Aspergillus</em> molds. One of the species we are particularly interested in is <a href="https://doi.org/10.1006/rwgn.2001.0082" target="_blank"><em>Aspergillus nidulans</em>, a relatively common and generally harmless fungus</a>. Clinical laboratories typically identify the species of <em>Aspergillus</em> causing the infection by examining cultures of the fungi under the microscope. The problem with this approach is that very closely related species of <em>Aspergillus</em> tend to look very similar in their broad morphology or physical appearance when viewing them through a microscope.</p><p>Interested in examining the varying abilities of different <em>A. nidulans</em> strains to cause disease, we decided to analyze their total genetic content, or genomes. What we saw came as a total surprise. We had not collected <em>A. nidulans</em> but <em>Aspergillus latus</em>, a close relative of <em>A. nidulans</em> and, as we were to soon find out, <a href="https://doi.org/10.1016/j.cub.2020.04.071" target="_blank">a hybrid species that evolved through the fusion of the genomes</a> of two other <em>Aspergillus</em> species: <em>Aspergillus spinulosporus</em> and an unknown close relative of <em>Aspergillus quadrilineatus</em>. Thus, we realized not only that these patients harbored infections from an entirely different species than we thought they were, but also that this species was the first ever <em>Aspergillus</em> hybrid known to cause human infections.</p>
Several Different Fungal Hybrids Cause Human Disease.<p>Hybrid fungi that can cause infections in humans are well known to occur in several different lineages of single-celled fungi known as yeasts. Notable examples include multiple different species of <a href="https://doi.org/10.1002/yea.3242" target="_blank">yeast hybrids</a> that cause the human diseases <a href="https://rarediseases.info.nih.gov/diseases/6218/cryptococcosis" target="_blank">cryptococcosis</a> and <a href="https://www.cdc.gov/fungal/diseases/candidiasis/index.html" target="_blank">candidiasis</a>. Although pathogenic yeast hybrids are well known, our discovery that the <em>A. latus</em> pathogen is a hybrid is a first for molds that cause disease in humans.</p>
(Left) Candida yeasts live on parts of the human body. Imbalance of microbes on the body can allow these yeasts, some of which are hybrids, to grow and cause infection. (Right) Cryptococcus yeasts, including ones that are hybrids, can cause life-threatening infections in primarily immunocompromised people. Centers for Disease Control and Prevention<p><a href="https://doi.org/10.1371/journal.ppat.1008315" target="_blank">Why certain <em>Aspergillus</em> species are so deadly</a> while others are harmless remains unknown. This may in part be because <a href="https://doi.org/10.1016/j.fbr.2007.02.007" target="_blank">combinations of traits, rather than individual traits</a>, underlie organisms' ability to cause disease. So why then are hybrids frequently associated with human disease? Hybrids inherit genetic material from both parents, which may result in new combinations of traits. This may make them more similar to one parent in some of their characteristics, reflect both parents in others or may differ from both in the rest. It is precisely this mix and match of traits that hybrids have inherited from their parental species that <a href="https://www.nytimes.com/2010/09/14/science/14creatures.html" target="_blank">facilitates their evolutionary success</a>, including their ability to cause disease.</p>
The Evolutionary Origin of an Aspergillus Hybrid.<p>Multiple evolutionary paths can lead to the emergence of hybrids. One path is through mating, just as the horse and donkey mate to create a mule. Another path is through the merging or fusion of genetic material from cells of different species.</p><p>It is this second path that appears to have been taken by our fungus. <em>A. latus</em> appears to have two of almost everything compared to its parental species: twice the genome size, twice the total number of genes and so on. But unlike other hybrids, which are often sterile like the mule, we found that <em>A. latus</em> is capable of reproducing both asexually and sexually.</p><p>But how distinct were the parents of <em>A. latus</em>? By comparing the parts contributed by each parent in the <em>A. latus</em> genome, we estimate that its parents are approximately 93% genetically similar, which is about as related as we humans are with lemurs. In other words, <em>A. latus</em>, an agent of infectious disease, is the fungal equivalent of a human-lemur hybrid.</p>
How A. Latus Differs From its Parents.<p>Elucidating the identity of closely related fungal pathogens and how they differ from each other in infection-relevant characteristics is a key step toward reducing the burden of fungal disease. For example, we found that <em>A. latus</em> was three times more resistant than <em>A. nidulans</em>, the species it was originally identified as using microscopy-based methods, to one of the most common antifungal drugs, <a href="https://www.drugbank.ca/drugs/DB00520" target="_blank">caspofungin</a>. This result provides a clear example of the potential importance of accurate identification of the <em>Aspergillus</em> pathogen causing an infection.</p><p>We also examined how <em>A. latus</em> and <em>A. nidulans</em> interact with cells from our immune system. We found that immune cells were less efficient at combating <em>A. latus</em> compared to <em>A. nidulans</em>, suggesting the hybrid fungus may be trickier for our immune systems to identify and destroy.</p><p>In the midst of the COVID-19 pandemic, our quest to understand <em>Aspergillus</em> pathogens is becoming more urgent. Growing evidence suggests that <a href="https://doi.org/10.1111/myc.13096" target="_blank">a fraction of COVID-19 patients are also infected with <em>Aspergillus</em>.</a> More worrying is that these <a href="https://doi.org/10.3201/eid2607.201603" target="_blank">secondary <em>Aspergillus</em> infections</a> can worsen the clinical outcomes for those infected with the novel coronavirus. That being said, we stress that little is known about <em>Aspergillus</em> infections in COVID-19 patients due to a lack of systematic testing, and none of the infections identified so far appear to have been caused by hybrids.</p><p>So, when it comes to hybrids, some are fantastic (the minotaur), some are helpful (the mule) and some are dangerous (<em>Aspergillus latus</em>). Understanding more about the biology of <em>Aspergillus latus</em> may help in our understanding of how microbial pathogens arise and how to best prevent and combat their infections.</p>
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