soil organic matter
21 views | +0 today
Follow
Your new post is loading...
Your new post is loading...
Scooped by Carla Fernanda Ferreira
Scoop.it!

Organic Matter #622 (From Ag PhD #622 3/7/10)

Brian & Darren explain the benefits of increasing organic matter in the soil.
more...
No comment yet.
Scooped by Carla Fernanda Ferreira
Scoop.it!

The Truth About Global Warming - Science & Distortion - Stephen Schneider

Stephen Henry Schneider (February 11, 1945 -- July 19, 2010) was Professor of Environmental Biology and Global Change at Stanford University, a Co-Director a...
more...
No comment yet.
Scooped by Carla Fernanda Ferreira
Scoop.it!

Regenerative Organic Agriculture and Climate Change: A Down-to ...

Regenerative Organic Agriculture and Climate Change: A Down-to ... | soil organic matter | Scoop.it
The Rodale Institute has recently published a White Paper titled "Regenerative Organic Agriculture and Climate Change: A Down-to-Earth Solution to Global Warming"
more...
No comment yet.
Rescooped by Carla Fernanda Ferreira from Amazing Science
Scoop.it!

Climate change determined humanity's global conquest in the past

Climate change determined humanity's global conquest in the past | soil organic matter | Scoop.it

Humans may have conquered the world, but not without a big helping hand from climate change. A major study of the last 120,000 years of history reminds us that, while we are adaptable, our species is ultimately at the mercy of the climate. Homo sapiens evolved in Africa around 200,000 years ago, but only left the continent about 70,000 years ago. After that our species rapidly went global, colonising first Europe and Asia, and then Australasia and the Americas.

 

But why did early humans linger so long in Africa, and what spurred them to finally move? Several theories have been proposed, but according to a large effort to reconstruct the last 120,000 years of human history – including the climate we lived in and the vegetation we fed on – the current population spread around the planet would not be as it is without key changes in the climate.

 

The new climate model revealed that climate changes probably had a key role in lifting four major roadblocks to humanity's global takeover. The first and most important roadblock was the Arabian peninsula, an impassable desert that trapped humans in Africa for tens of thousands of years. Then, 70,000 years ago it began receiving more rain. The coastal areas became more fertile, allowing humans out of Africa. One group expanded east into Asia, spreading south-east into Indonesia. There, they hit a second roadblock: high sea levels meant that wide stretches of open water separated the many islands. Manica assumed that crossings of 100 kilometres were a bridge too far, leaving pioneers no way to reach Australia. That meant people could only go further once sea levels fell, exposing more patches of low-lying land and making for shorter sea journeys. The waters fell 60,000 years ago and then again 15,000 years later, as successive glaciations trapped more of the world's water at the poles.

 

Further north, humans reached Siberia by 30,000 years ago, where they were met by a vast ice sheet which prevented them from entering North America – the third roadblock. Not until 15,000 years ago did it shrink, allowing them into the Americas. Once in, they spread rapidly. Back in Europe and Asia, populations faced one last roadblock: their local ice sheets. During warm periods humans went north into Scandinavia and northern Asia, but they were forced south when the ice advanced again.


Via Dr. Stefan Gruenwald
more...
No comment yet.
Scooped by Carla Fernanda Ferreira
Scoop.it!

Deep Mulch, No-Till, Garden at Prairie Road Organic

Take a tour of the Podoll's family garden and discover the benefits of a deep mulch, no-till organic, garden system. The Podolls demonstrate how they go abou...
more...
No comment yet.
Scooped by Carla Fernanda Ferreira
Scoop.it!

Photoreduction and Stabilization Capability of Molecular Weight Fractionated Natural Organic Matter in Transformation of Silver Ion to Metallic Nanoparticle - Environmental Science & Technology (AC...

Photoreduction and Stabilization Capability of Molecular Weight Fractionated Natural Organic Matter in Transformation of Silver Ion to Metallic Nanoparticle - Environmental Science & Technology (AC... | soil organic matter | Scoop.it
@EnvSciTech: Natural Organic Matter in Transformation of Silver Ion to Metallic Nanoparticle http://t.co/X8a6iTbdES http://t.co/JPJWDLvyry
more...
No comment yet.