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All experts agree that conditions have been near-perfect for this year's sockeye, a strikingly red species with a dramatic four-year life cycle.
Irrigation can have a major cooling effect in some regions. Credit: U.S. Department of Agriculture.
disclaimer: image is for illustration purposes only
Scientists investigating geoengineering have so far looked mainly at injecting sulphur dioxide into the upper atmosphere. This approach imitates the way volcanoes create sulphuric acid aerosols, or sulphates, that will reflect solar radiation back into space - thereby cooling the planet's surface.
Keith says that sulphates are blunt instruments for climate engineering. It's very difficult to achieve the optimum distribution and size of the aerosols in the atmosphere to reflect the most solar radiation and get the maximum cooling benefit. One advantage of using sulphates is that scientists have some understanding of their effects in the atmosphere because of emissions from volcanoes such as Mt. Pinatubo, he adds.
Brazil has had a series of hydrocarbon discoveries offshore that raised the stakes for both security of the new oil fields and the cash required to exploit them.
|New Climate Change Mitigation Schemes Could Benefit Elites More Than Poor |
Oaxaca, Mexico (SPX) Sep 09, 2010 - With governments across Latin America preparing to implement a new financial mechanism aimed at mitigating climate change by curbing carbon emissions from the destruction of tropical forests, experts have warned against a "one-size-fits-all" approach, calling instead for flexible, balanced solutions to the thorny dilemmas surrounding this new mechanism. Among the experts' chief worries is ... more
Researchers theorize that a weakening Gulf Stream at the start of the last ice age drove the north into freezing temperatures while simultaneously affecting the planet's wind patterns and ocean currents, pushing warm air and seawater south.
Making a Nano-Water Filter for the Developing World
by Katherine Bourzac
Researchers at Stanford University in Palo Alto, California are developing a filter that rapidly kills bacteria in water. The researchers hope their filter will be used in the developing world, where at least one billion people lack access to clean water.
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|Drought, wildfires put Brazil under environmental emergency |
Brasilia (AFP) Sept 7, 2010 - Hundreds of wildfires fed by weeks of relentless drought have forced authorities to place 15 of Brazil's 26 states under an environmental emergency, the official Agencia Brasil news agency said Tuesday. The decree, which includes the capital Brasilia, authorizes federal emergency plans and funds to fight some 1,200 wildfires threatening indigenous reservations, farms and across the country, ... more