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Thursday, March 27, 2014

Fresh Water - Adds to METHANE BOMB!





Deadly Beautiful?

Global Warming Speeds Up Methane Emissions From Freshwater


By Tim Radford

(Climate News Network) – Methane or natural gas is a greenhouse gas. Weight for weight, it is more than 20 times more potent than carbon dioxide (CO2) over a century, and researchers have repeatedly examined the contribution of natural gas emitted by ruminant cattle to global warming. But Gabriel Yvon-Durocher of the University of Exeter and colleagues considered something wider: the pattern of response to temperature in those natural ecosystems that are home to microbes that release methane. 

They report in Nature that they looked at data from hundreds of field surveys and laboratory experiments to explore the speed at which the flow of methane increased with temperature.


How it Works
Microbes, algae, freshwater plants, and animals are all part of an active ecosystem and take their nourishment from and return waste to the atmosphere. Healthy plants take CO2 from the atmosphere with photosynthesis. Most of the methane in freshwater systems is produced by an important group of microbes called Archaea that live in waterlogged, oxygen-free sediments and play an important role in decay.

Plant uptake of CO2 is affected by temperature, and so is microbial methane production. Respiration also releases CO2. The questions the researchers set out to answer were: which gas is more likely to be released in greater quantities as temperatures rise? And is the outcome the same whether they examine the Archaea only, or all the microbes in an ecosystem, or the entire package of submerged freshwater life?


Possible Outcomes
  The answer is, the scientists say, that methane emissions go up with the mercury, and that the ratio of methane to CO2 also goes up in step with temperature. And the result is the same whether you consider the microbes or the whole ecosystem.

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