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US DOI report highlights impacts of climate change on Western water resources

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Projected median temperature change in °F (of 112 climate projections) over the Western United States, 2070–2099 relative to 1950–1979. The report, which responds to requirements under the SECURE Water Act of 2009, details several increased risks to western United States water resources during the 21 st century.

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Study Finds Water Use for Switchgrass Ethanol Production Approximately the Same as for Gasoline

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In the US, producing one gallon of ethanol from switchgrass consumes approximately the same net amount of water as does producing a gallon of gasoline from conventional crude or oil sands oil, according to a study by Argonne National Laboratory researchers presented at the 238 th national meeting of the American Chemical Society last week.

Water 292
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UC Davis ITS researchers take a detailed look at water consumption and withdrawal requirements for ethanol

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Water consumption intensity of ethanol from corn grain and crop residue and the avoided/displaced water use credits assigned to coproducts: DGS and electricity. In their paper, Mishra and Yeh analyze the lifecycle water requirement consumption and withdrawal requirements of ethanol produced from corn and from crop residue.

Water 199
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New ORNL tool to assess global freshwater stress suggests that population growth could be a bigger factor in water availability than increasing temperatures

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Our tool provides a simple method to integrate disparate climate and population data sources and develop preliminary per capita water availability projections at a global scale. Parish and co-authors Evan Kodra, Karsten Steinhaeuser and Auroop Ganguly began working on this approach at ORNL in the summer of 2009. —Esther Parish.

Water 236
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IHS Markit: conventional oil & gas discoveries at lowest levels in 70 years; major rebound unlikely

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One of the main drivers here is the shift of investment by US independents from international exploration to shale opportunities in the United States—shorter cycle-time projects—with greater flexibility to respond to changing market conditions. Drilling in frontier/emerging-phase basins declined by a similar amount.

Oil 199
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Study Finds Regional Variations in Irrigation Practices Can Push Corn Ethanol Water Requirements 3x Higher Than Earlier Estimates; Need to Account for Regional Specifics in Mandates

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The foreground bar height indicates the EWe of each state, with the portion of ground and surface water indicated by color. The TCW, as measured by a state’s EWe and ethanol production (seen in the background), illustrates local and regional ethanol-induced impacts. Credit: ACS. Click to enlarge. Chiu et al.

Water 170
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Study Finds Ozone, Nitrogen Change the Way Rising CO2 Affects Earths Water

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Through a recent modeling experiment, a team of NASA-funded researchers have found that future concentrations of carbon dioxide and ozone in the atmosphere and of nitrogen in the soil are likely to have an important but overlooked effect on the cycling of water from sky to land to waterways. Click to enlarge.

Ozone 186