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Ancient human tree cultivation shaped Amazon landscape

Ancient human tree cultivation shaped Amazon landscapeBy Will Dunham WASHINGTON (Reuters) - Ancient indigenous peoples had a far more profound impact on the composition of the vast Amazon rainforest than previously known, according to a study showing how tree species domesticated by humans long ago still dominate big swathes of the wilderness. Researchers said on Thursday many tree species populating the Amazon region appear to be abundant because they were cultivated by people who populated the area before Europeans arrived more than five centuries ago. "So the Amazon is not nearly as untouched as it may seem," said study researcher Hans ter Steege, a forest community ecologist at the Naturalis Biodiversity Center in the Netherlands and Free University of Amsterdam.




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LPG tunkey project solution in Bangladesh

What is LPG?
Liquefied Petroleum Gas (LPG) is a clean and safe fuel that has a range of properties closest to petrol. It is a by-product of petrol refining and natural gas production. Under slight pressure, LPG turns into liquid form and can then be stored in tanks. 
LPG is a naturally occurring by-product of natural gas extraction (60%) and crude oil refining (40%). It is therefore either used or it is wasted.It is a combination of propane and butane molecules, along with trace amounts of other compounds. 

The key property of LPG is the fact that it is highly calorific gas, which easily condenses even at relatively low pressures and current temperatures. Thank to these properties it can be stored also in small tanks or cylinders.
Another key property of LPG is its easy vaporization and possibility of combustion in gaseous state, when it has even 3x greater calorific value than natural gas and at the same time belongs among most ecological fuels. Pure propane vaporizes at temperatures hig…