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Tag: freshwater
Global human freshwater footprint surges
2015-12-04 16:02:00| Climate Ark Climate Change & Global Warming Newsfeed
ScienceDaily: The new study shows that dams and irrigation considerably raise the global human consumption of freshwater by increasing evapotranspiration. This effect increases the loss of freshwater to the atmosphere and thereby reduces the water available for humans, societies and ecosystems on land. "Small things that we do on the surface of the Earth can have large global effects. Previously, the global effects of local human activities such as dams had been underestimated. This study shows that, so far,...
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Is freshwater supply more dependent on good governance than geography?
2015-10-25 08:02:00| Climate Ark Climate Change & Global Warming Newsfeed
ScienceDaily: Scientists have analysed 19 different characteristics critical to water supply management in 119 low per capita income countries and found that vulnerability is pervasive and commonly arises from relatively weak institutional controls. The study, conducted by researchers based at Washington State University (WSU), USA, and Stanford University, USA, sought to identify freshwater supply vulnerabilities using four broad categories; endowment (availability of source water), demand, infrastructure and...
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New study reveals mechanism regulating methane emissions in freshwater wetlands
2015-06-30 23:02:00| Climate Ark Climate Change & Global Warming Newsfeed
ScienceDaily: Though they occupy a small fraction of Earth's surface, freshwater wetlands are the largest natural source of methane going into the atmosphere. New research from the University of Georgia identifies an unexpected process that acts as a key gatekeeper regulating methane emissions from these freshwater environments. The study, published in Nature Communications by Samantha Joye and colleagues, describes how high rates of anaerobic methane oxidation, a process once considered insignificant in these...
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Freshwater fish threatened by acidification
2015-06-30 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
Science: Acidifying ocean watera byproduct of increased carbon dioxide in the atmospheremesses with saltwater fish in a variety of ways. Rockfish become more nervous. Clownfish cant always detect predators, whereas the brown dottyback actually avoids the smell of injured prey. But it turns out that saltwater fish arent the only ones affected. Pink salmon reared in CO2-rich fresh water showed many of the same signs as their marine brethren, according to a study published today in the journal Nature Climate...
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acidification
How dramatic climate change Southern Sahara reduced largest freshwater lake desert dunes
2015-06-30 03:02:00| Climate Ark Climate Change & Global Warming Newsfeed
ScienceDaily: Researchers from Royal Holloway, Birkbeck and Kings College, University of London used satellite images to map abandoned shore lines around Palaeolake Mega-Chad, and analysed sediments to calculate the age of these shore lines, producing a lake level history spanning the last 15,000 years. At its peak around 6,000 years ago, Palaeolake Mega-Chad was the largest freshwater lake on Earth, with an area of 360,000 km2. Now today's Lake Chad is reduced to a fraction of that size, at only 355 km2. The...
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