[naturenews] from [nature.com]
[naturenews]
Published online 17 November 2009 | Nature | doi:10.1038/news.2009.1092
News
Climate model sets tough targets
International group outlines steps needed to reach 'safe' levels of carbon dioxide.
Olive Heffernan
{{A new model suggests that emissions will have to near zero by 2100.}
Ingram Publishing}
Carbon dioxide emissions will have to be all but eliminated by the end of this century if the world is to avoid a temperature rise of more than 2 ºC, scientists warned yesterday. And it might even be necessary to start sucking greenhouse gases out of the atmosphere.
The findings are the culmination of five years work by Ensembles, a major European research consortium led by the UK Met Office Hadley Centre and involving 65 other research institutes worldwide. In the first study of its kind, scientists in the project used a variety of the latest global climate models to determine the reductions needed to stabilize levels of greenhouse gases, termed CO2 equivalents, at 450 parts per million. That level, which offers a reasonable chance of keeping the temperature rise under 2ºC, is the goal of European climate policy.
The results suggest that to achieve that target, emissions would have to drop to near zero by 2100. One of Ensemble's models predicted that by 2050, it might also be necessary to introduce new techniques that can actually pull CO2 out of the atmosphere.
Ensemble is a radically different approach from the gold-standard climate projections, which are run by Intergovernmental Panel on Climate Change (IPCC), the United Nation's climate body. The IPCC runs models for a range of 'what if' scenarios that make various assumptions about the future, such as the level of emissions, technological and economic development. None of these scenarios account for the impact of policy on climate change.
Latest model
The Ensembles project works the other way around. Its scenario, named E1, assumes that atmospheric levels of CO2 equivalents cannot rise above 450 parts per million, then looks at the mitigation that policy-makers would need to pursue to achieve that. Currently, the level of atmospheric CO2 sits at 390 parts per million, about a third higher than that of pre-industrial times.
The results suggest that simply switching to renewable sources of energy may not be enough to stabilize emissions. "It's clear that if we continue our current emissions trajectory and we want to stay at 450 parts per million, we'll need to pull CO2 out of the atmosphere," says atmospheric scientist Ken Caldeira, who works at the Carnegie Institution for Science's Department of Global Ecology in Stanford, California. That could mean deploying new techniques for capturing carbon, such as biochar, reforestation or air filtering, on a massive scale.
Caldeira adds that action now could be a better option. If people stop building new CO2-emitting devices within the next decade, they could achieve the same result at a lower cost.
The results should send a strong message to climate negotiators, who are expected to delay signing a global climate treaty beyond the December deadline set by the United Nations. "Policy-makers need to think very seriously about what kind of world they can point us towards," says Paul van der Linden, director of the Ensembles project.
"We need to reverse the trend of increasing emissions and for that we will need strong policy," adds Jean-François Royer of the National Meteorological Research Centre in Toulouse, France, who headed up the work on the new scenario. "If there is no international agreement to reduce emissions, no one will do it by themselves".
E1 is a taste of things to come. The IPCC will employ the same approach in its next report, due out in 2013.
[naturenews]
Published online 17 November 2009 | Nature | doi:10.1038/news.2009.1093
News
Biologists rally to sequence 'neglected' microbes
For scientists, the thousandth microbial genome is just the start.
Elie Dolgin
{{Scientists want to sequence thousands of microbial genomes from across the tree of life.}
R. Kaltschmidt /LBNL}
The GenBank sequence database, the central repository of all publicly available DNA sequences, counted its thousandth complete microbial genome this month. But a thousand genomes is only a small fraction of the diversity that exists in the microscopic world. Now, scientists want to fill in the gaps.
"The broad brush strokes of microbial diversity are not adequately represented in that first thousand," says Stephen Giovannoni, a microbiologist at Oregon State University in Corvallis. "It's absolutely important that we sequence more."
Enter the Genomic Encyclopedia of Bacteria and Archaea, a project spearheaded by the US Department of Energy's Joint Genome Institute (JGI) in Walnut Creek, California, which aims to sequence the genomes of another thousand or so microbes.
The vast majority of microbial species that have had their genomes decoded come from just three groups and were chosen because of their medical or environmental importance. The encyclopedia's researchers are picking microbes from many more branches of the evolutionary tree of life.
Branching out
A pilot project, led by Jonathan Eisen, an evolutionary biologist at the University of California, Davis, demonstrates the ways in which such as approach can pay off. Eisen's team selected and sequenced more than 100 'neglected' species that lacked close relatives among the 1,000 genomes already in GenBank. The researchers reported earlier this year at the JGI's Fourth Annual User Meeting that even mapping the first 56 of these microbes' genomes increased the rate of discovery of new gene and protein families with new biological properties. It also improved the researchers' ability to predict the role of genes with unknown functions in already sequenced organisms.
"There's no doubt to us that filling in the branches of the tree is going to be useful to lots of scientific studies that use genomic data," says Eisen. "There have been four billion years of evolution and we can really benefit from having some of that information in our databases."
All these new genomes should improve researchers' understanding of the evolution, physiology and metabolic capacity of microbes, says Eisen. They will also help match DNA sequences to their proper species from large-scale, high-throughput metagenomic studies from environmental samples, and ultimately contribute in the fields of synthetic biology and genetic engineering.
Microbial madness
The JGI is not alone in sequencing the genomes of new microbes. The next phase of the Human Microbiome Project, an initiative run by the US National Institutes of Health to characterize all the microorganisms living in or on our bodies, involves deciphering 900 microbial genomes of species from five body sites — skin, mouth, nose, gut and vagina. The Ten Thousand Microbial Genomes Project, launched in August by the Beijing Genomics Institute-Shenzhen, plans to create full genome maps for 10,000 strains — but fewer species — of bacteria, archaea, fungi, algae and viruses from a broad range of conventional and extreme environments in China.
And even more ambitious microbial initiatives are in the works. Nikos Kyrpides, head of the JGI's genome-biology programme, is planning an international, five-year effort to sequence all 15,000 known microbes that can live in laboratory culture. He hopes to publish a paper outlining the project's goals in the coming months. "This will completely transform our understanding of microbiology and the microbial planet," he says.
[naturenews]
Published online 17 November 2009 | Nature | doi:10.1038/news.2009.1092
News
Climate model sets tough targets
International group outlines steps needed to reach 'safe' levels of carbon dioxide.
Olive Heffernan
{{A new model suggests that emissions will have to near zero by 2100.}
Ingram Publishing}
Carbon dioxide emissions will have to be all but eliminated by the end of this century if the world is to avoid a temperature rise of more than 2 ºC, scientists warned yesterday. And it might even be necessary to start sucking greenhouse gases out of the atmosphere.
The findings are the culmination of five years work by Ensembles, a major European research consortium led by the UK Met Office Hadley Centre and involving 65 other research institutes worldwide. In the first study of its kind, scientists in the project used a variety of the latest global climate models to determine the reductions needed to stabilize levels of greenhouse gases, termed CO2 equivalents, at 450 parts per million. That level, which offers a reasonable chance of keeping the temperature rise under 2ºC, is the goal of European climate policy.
The results suggest that to achieve that target, emissions would have to drop to near zero by 2100. One of Ensemble's models predicted that by 2050, it might also be necessary to introduce new techniques that can actually pull CO2 out of the atmosphere.
Ensemble is a radically different approach from the gold-standard climate projections, which are run by Intergovernmental Panel on Climate Change (IPCC), the United Nation's climate body. The IPCC runs models for a range of 'what if' scenarios that make various assumptions about the future, such as the level of emissions, technological and economic development. None of these scenarios account for the impact of policy on climate change.
Latest model
The Ensembles project works the other way around. Its scenario, named E1, assumes that atmospheric levels of CO2 equivalents cannot rise above 450 parts per million, then looks at the mitigation that policy-makers would need to pursue to achieve that. Currently, the level of atmospheric CO2 sits at 390 parts per million, about a third higher than that of pre-industrial times.
The results suggest that simply switching to renewable sources of energy may not be enough to stabilize emissions. "It's clear that if we continue our current emissions trajectory and we want to stay at 450 parts per million, we'll need to pull CO2 out of the atmosphere," says atmospheric scientist Ken Caldeira, who works at the Carnegie Institution for Science's Department of Global Ecology in Stanford, California. That could mean deploying new techniques for capturing carbon, such as biochar, reforestation or air filtering, on a massive scale.
Caldeira adds that action now could be a better option. If people stop building new CO2-emitting devices within the next decade, they could achieve the same result at a lower cost.
The results should send a strong message to climate negotiators, who are expected to delay signing a global climate treaty beyond the December deadline set by the United Nations. "Policy-makers need to think very seriously about what kind of world they can point us towards," says Paul van der Linden, director of the Ensembles project.
"We need to reverse the trend of increasing emissions and for that we will need strong policy," adds Jean-François Royer of the National Meteorological Research Centre in Toulouse, France, who headed up the work on the new scenario. "If there is no international agreement to reduce emissions, no one will do it by themselves".
E1 is a taste of things to come. The IPCC will employ the same approach in its next report, due out in 2013.
[naturenews]
Published online 17 November 2009 | Nature | doi:10.1038/news.2009.1093
News
Biologists rally to sequence 'neglected' microbes
For scientists, the thousandth microbial genome is just the start.
Elie Dolgin
{{Scientists want to sequence thousands of microbial genomes from across the tree of life.}
R. Kaltschmidt /LBNL}
The GenBank sequence database, the central repository of all publicly available DNA sequences, counted its thousandth complete microbial genome this month. But a thousand genomes is only a small fraction of the diversity that exists in the microscopic world. Now, scientists want to fill in the gaps.
"The broad brush strokes of microbial diversity are not adequately represented in that first thousand," says Stephen Giovannoni, a microbiologist at Oregon State University in Corvallis. "It's absolutely important that we sequence more."
Enter the Genomic Encyclopedia of Bacteria and Archaea, a project spearheaded by the US Department of Energy's Joint Genome Institute (JGI) in Walnut Creek, California, which aims to sequence the genomes of another thousand or so microbes.
The vast majority of microbial species that have had their genomes decoded come from just three groups and were chosen because of their medical or environmental importance. The encyclopedia's researchers are picking microbes from many more branches of the evolutionary tree of life.
Branching out
A pilot project, led by Jonathan Eisen, an evolutionary biologist at the University of California, Davis, demonstrates the ways in which such as approach can pay off. Eisen's team selected and sequenced more than 100 'neglected' species that lacked close relatives among the 1,000 genomes already in GenBank. The researchers reported earlier this year at the JGI's Fourth Annual User Meeting that even mapping the first 56 of these microbes' genomes increased the rate of discovery of new gene and protein families with new biological properties. It also improved the researchers' ability to predict the role of genes with unknown functions in already sequenced organisms.
"There's no doubt to us that filling in the branches of the tree is going to be useful to lots of scientific studies that use genomic data," says Eisen. "There have been four billion years of evolution and we can really benefit from having some of that information in our databases."
All these new genomes should improve researchers' understanding of the evolution, physiology and metabolic capacity of microbes, says Eisen. They will also help match DNA sequences to their proper species from large-scale, high-throughput metagenomic studies from environmental samples, and ultimately contribute in the fields of synthetic biology and genetic engineering.
Microbial madness
The JGI is not alone in sequencing the genomes of new microbes. The next phase of the Human Microbiome Project, an initiative run by the US National Institutes of Health to characterize all the microorganisms living in or on our bodies, involves deciphering 900 microbial genomes of species from five body sites — skin, mouth, nose, gut and vagina. The Ten Thousand Microbial Genomes Project, launched in August by the Beijing Genomics Institute-Shenzhen, plans to create full genome maps for 10,000 strains — but fewer species — of bacteria, archaea, fungi, algae and viruses from a broad range of conventional and extreme environments in China.
And even more ambitious microbial initiatives are in the works. Nikos Kyrpides, head of the JGI's genome-biology programme, is planning an international, five-year effort to sequence all 15,000 known microbes that can live in laboratory culture. He hopes to publish a paper outlining the project's goals in the coming months. "This will completely transform our understanding of microbiology and the microbial planet," he says.