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Climate: BLM eyes plan to cut methane emissions

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The Earth’s atmosphere can’t take a lot more methane.

Possible new rule would target methane from existing mining operations

By Summit Voice

FRISCO — While federal efforts to cut carbon dioxide emissions are still up in the air due to political and legal uncertainty, the Bureau of Land Management is taking public on a possible new rule to tackle heat-trapping methane from coal mining operations. In a prepared statement announcing the outreach effort, BLM officials said that reducing methane emissions is a powerful way to take action on climate change.

“We welcome public input on ways in which we can both increase mine safety and improve the health of our environment,” said BLM Director Neil Kornze. “We will work with federal, state and local officials as well as with industry and nongovernmental organizations to explore ways to responsibly reduce methane emissions,”

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Mediterranean fossils offer new climate clues

Findings shed new light in links between temperatures, CO2 and glaciation

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How will Antarctic ice sheets and glaciers respond to global warming? bberwyn photo.

Staff Report

FRISCO — The relationship between global temperatures and the massive glaciation of historic ice ages may be a bit more complex than previously believed.

By studying the chemical composition of Mediterranean Sea fossils as old as 5.3 million years, scientists found a new way to assess sea-level changes and deep-sea temperature variability over the past 5.3 million years. The findings will result in a better understanding of ice age climate, and could offer new insight into the relationship between carbon dioxide levels, global temperatures and sea levels. Continue reading

Climate: ‘We need to move away from business as usual’

Curbing global warming will require big cuts in greenhouse gases

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March 2014 temperatures were above average across most of the globe.

By Summit Voice

FRISCO —Greenhouse gas emissions continue to climb despite international attempts to curb heat-trapping gases, the Intergovernmental Panel on Climate Change said in its latest climate report.

Issued Sunday in Berlin, the report shows that greenhouse gas emissions grew more quickly between 2000 and 2010 than in each of the three previous decades. Only with significant institutional, social and technological changes will humankind be able to meet its stated target of limiting warming to two degrees Celsius, the scientists wrote. Continue reading

Study: Little chance that global warming is natural

Statistical analysis of temperature data affirms climate models

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Warmer than average temperatures prevailed across most of the globe in March 2014.

Staff Report

FRISCO — A new statistical analysis of temperature records dating back to 1500 suggests it’s more than 99 percent certain that the past century of global warming is caused by the emission of heat-trapping, industrial-age greenhouse gases. The study was published online April 6 in the journal Climate Dynamics.

In a press release, the McGill University researchers said the study doesn’t use complex computer models to estimate the effects of greenhouse-gas emissions. Instead, it examines historical data to assess the competing hypothesis that warming over the past century is due to natural long-term variations in temperature. The results all but rule out  the possibility that global warming in the industrial era is just a natural fluctuation in the earth’s climate. Continue reading

Study: CO2 buildup could affect food quality

Wheat field in Upper Austria

A wheat field in Upper Austria ripens under a summer sun. bberwyn photo.

Protein levels in key grains could decline by 3 percent

Staff Report

FRISCO — Along with cutting yields of some key crops, increasing atmospheric carbon dioxide is also expected to affect the nutritional quality of food crops. Field tests by UC Davis scientists show that elevated levels of carbon dioxide make it harder for some plants to convert nitrogen into proteins.

“Food quality is declining under the rising levels of atmospheric carbon dioxide that we are experiencing,” said lead author Arnold Bloom, a professor in the Department of Plant Sciences at UC Davis. “Several explanations for this decline have been put forward, but this is the first study to demonstrate that elevated carbon dioxide inhibits the conversion of nitrate into protein in a field-grown crop,” Bloom said. Continue reading

Climate: Methane emissions from freshwater ecosystem set to soar as Earth warms

New study assesses freshwater methane on a global scale

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Microorganisms in freshwater ecosystems generate significant amounts of methane.

Staff Report

FRISCO — After recalculating Earth’s greenhouse gas budget, Princeton scientists say that methane emissions will start increasing at a faster pace than carbon dioxide, primarily due to the release of methane from microscopic freshwater organisms.

Methane is about 30 times more effective than CO2 at trapping the sun’s heat, and for every degree of warming, methane emissions will increase several times over, according to the research published in Nature.

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Climate: Permafrost thaw doubles carbon losses

Study says greening tundra won’t offset permafrost meltdown

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Study says new plant growth won’t compensate for carbon emissions from melting tundra in the Arctic. bberwyn photo.

Staff Report

FRISCO — Permafrost could dwindle by 30 to 70 percent by the end of the century, and more vegetation in the Arctic won’t be enough to offset the carbon emissions from thawing organic soils.

Scientists with the Woods Hole Research Center reached their conclusions after a series of field tests designed to measure net gains or losses in carbon emissions. The study is published in the journal Ecology.

“Our results show that while permafrost degradation increased carbon uptake during the growing season, in line with decadal trends of ‘greening’ tundra, warming and permafrost thaw also enhanced winter respiration, which doubled annual carbon losses,” said WHRC assistant scientist Sue Natali. Continue reading

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