Scholars have suggested, among other reasons, disease, political upheaval, overpopulation or drought.
He said they would monitor and assist those who had fled into eastern Afghanistan from fighting or drought - although this did not necessarily mean setting up camps.
Simon Best, former head of plant science at Zeneca, looks forward to the day when molecular switches might be so sophisticated that the process of infection or drought will itself be enough to turn on a genetically engineered resistance gene.
Cattle drowned can be crudely counted (140, 000, says one estimate for Argentina's Santa Fe province, stretched along 800km of the Parana), and the loss of crops ruined by flood or drought can be reckoned, but the long-term effects may take years to show up.
Imagine if GM could be used to create crops that produced higher yields, or were resistant to drought or could even fix their own nitrogen and produce their own fertiliser.
An uneven swath from northern to southwestern Colorado has severe drought conditions, while the rest of the state has either extreme or exceptional drought conditions.
When we reduce hunger in the world, or help a farmer recover from a flood or a drought, it strengthens the entire world economy.
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Where water is scarce, the development of crop varieties that grow under conditions of low moisture or temporary drought could boost yields and lengthen the time that farmland is productive.
It was a standing joke in the commentary box that his arrival on the air would coincide with a drinks interval, an injury to a player, a break for bad light or a drought of run-scoring.
Overleaf, we follow the fortunes of Homo sapiens sapiens around the Black and Mediterranean Seas through 30 000 years of a tumultuous history marked by sporadic earthquakes, tsunamis and volcanic eruptions, as well as more insidious hazards tied to a changing climate, such as flooding from glacier melt, gradual sea-level rise or prolonged drought.
The mysterious ailment was a new disease, or it was a response to drought, or to stress, or to toxins.
That is understandable when drought or deluge can destroy their crop, but it has the effect of reducing yields.
"You expect one problem in one department every year, be it drought or wet, or poor lambing percentages or something, " he said.
Most older North Dakotans remain dependent on entitlements, she says, and local farmers are still one drought or hailstorm away from disaster.
The Douglas fir, which produces more seeds than the Ponderosa pine but is much less tolerant of drought or fire, did especially well.
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The report highlights in particular the increasing phenomenon of migration from rural to urban areas, often as a result of drought or flooding in the countryside.
You know how to look out for each other in the face of drought or tornadoes or disasters, looking out for each other until we reach a brighter day.
They included disruption to operations from drought or flooding, declining water quality that required costly on-site pretreatment, increases in water prices, and fines and litigation relating to pollution incidents.
Eking out a living is tough, and the vagaries of climate that bring drought or floods can easily wipe away in a few days the gains of many years.
Concerns about quality control also apply: Weather patterns affect crops differently year to year, and major events like drought or flooding can cause the prices of raw materials to spike.
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The water company has agreed to buy 75 GWh of this output to run Beckton sewage works, which serves 3.5 million people, and the nearby desalination plant, operated in times of drought or other emergencies.
The Gelede takes place every year after the harvests, at important events and during drought or epidemics and is characterized by carved masks, dances and chants, sung in the Yoruba language and retracing the history and myths of the Yoruba-Nago people.
Lawn and golf-course grass will be tougher, trees more resistant to drought, or adapted to clean up contaminated soil.
Orion Genomics hopes to start pulling in revenues next year from its proprietary method of sequencing, mapping and cloning agricultural genes--technology that can be used to improve crop yield, develop pest resistance or help plants survive drought, flooding and cold.
In the best of the older vintages, like 1961, 1959, 1947 and 1945, yields were very limited due to drought conditions or poor flowering, and the resulting wines are unforgettable, so complex and captivating that the room went silent for minutes as we all marveled at the kaleidoscopic aromas and flavors in the glass.
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However, it will take a second or third year of bad drought for food prices to really have a persistent impact.
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While it can currently produce enough food grains for its people, Bangladesh still needs to protect itself against drought, flooding or other natural disasters.
Roberts added that in times of drought, flood or other forces of nature that hurt farmers, Congress generally passes disaster relief bills that cost billions and are bureaucratic nightmares.
"If we get one more storm like this with widespread 2 inches of moisture, we will continue to chip away at the drought, but to claim the drought is over or ending is way too premature, " Umscheid said.
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