Word: replenishment
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...plant scientists. It's a back-to-basics approach that avoids gambling on shortcuts. But to be successful the new initiative--dubbed the Alliance for a Green Revolution in Africa--will very soon have to address two equally pressing issues: the need for widespread use of chemical fertilizers to replenish exhausted soil and some sort of system to ensure greater participation of women--who perform the bulk of the work on Africa's farms...
...many families in Baghdad, the only way to deal with those dangers is somehow to limit exposure to them. People venture outside only to replenish dwindling supplies of food, cooking gas and fuel for generators. Some Iraqis no longer send their children to school. The only new freedom they can savor is access to satellite television...
...perilous Gulf Coast from Florida to Texas? Soggy soil, eroding shorelines and sudden storms make the whole region an unstable mess even without human intervention. And the more we build there, the worse we seem to make things, clawing away the natural river routes and marshlands that replenish the land and sucking out the oil and other subterranean resources that hold up the surface. Now, many experts warn, with greenhouse gases raising global temperatures, we are spawning more and deadlier hurricanes, ones that could kill a city in a single blow--if Katrina hasn't already done that...
...made mostly of silt deposited by eons of free-flowing rivers and periodic floods. When the high water recedes, the sedimentary layer remains, growing heavier and heavier and ultimately subsiding under its own weight. The only way to keep the land from sinking altogether is to let the soil replenish itself with each flood. Human beings have done just the opposite, walling off New Orleans and re-engineering the Mississippi River to flow around the growing metropolis, effectively choking off the silt supply...
...decades about an influx of freshwater--not just from Greenland but also from melting icebergs and increasing mainland runoff. The resulting drop in salinity could change the density of surface water enough to prevent it from sinking as it cools and returning south to the tropics where it can replenish ocean currents like the Gulf Stream. And because the Gulf Stream is the only reason much of Western Europe has so mild and temperate a climate, such a shutdown of that conveyor belt of heat could be nothing short of catastrophic. Oceanographers reported late last year the ominous news that...