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hadi salman
June 14, 2013 11:06AM

i ask did demulsifier cause damage to catalysis in refinery process with referen...
hadi salman
June 14, 2013 11:06AM

i want ask about catalysis
Erich Knight
June 08, 2013 05:06AM

The Clovis people & the Younger Dryas knocked out 80% of large land mammals ...
SATHISH KOKKULA
June 04, 2013 08:06PM

Very clear and concise information.

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      Welcome to the Africa Collection! This new collection is centered on the environmental, economic and social challenges faced by the people of Africa. The goal of this collection... More »

    • Agriculture II Featured Gallery Agriculture II Agriculture II

      Humans began to cultivate food crops about 10,000 years ago. Prior to that time, hunter-gatherers secured their food as they traveled in the nearby environment. When they... More »

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Agriculture II Last Updated on 2012-07-26 at 11:56 Humans began to cultivate food crops about 10,000 years ago. Prior to that time, hunter-gatherers secured their food as they traveled in the nearby environment. When they... More »
Birds : Warming Could Benefit Some Species Last Updated on 2012-05-07 at 19:07 Birds, particularly those that fly, have a high metabolic rate that heightens their sensitivity to their immediate surroundings. As such, they have long served as bellwethers... More »
Polar Bears: Struggling in the Warming Arctic Last Updated on 2012-05-07 at 18:47 The polar bear is one of the world’s largest carnivores. It inhabits the ice-covered waters of the circumpolar Arctic, particularly annual ice over the continental shelf... More »
Penguins: Endangered by Melting Ice Last Updated on 2012-05-07 at 18:46 Rising temperatures and loss of snowpack or ice caps endangers a number of alpine and arctic species, including penguins. At the Antarctic, several species of penguins that... More »
Wine Grapes: Vulnerable to High Temperatures Last Updated on 2012-05-07 at 18:08 As temperatures rise in response to increasing greenhouse gas emissions, effects of climate change on the agriculture industry will become more pronounced. The largest impact... More »
Agriculture I Last Updated on 2011-09-12 at 11:06 Humans began to cultivate food crops about 10,000 years ago. Prior to that time, hunter-gatherers secured their food as they traveled in the nearby environment. When they... More »
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