Emissions of African dust increased sharply in the early 1970s, but the human contribution to land degradation and dust mobilization remains poorly understood. Now, a 3,200-year record of dust deposition off northwest Africa has been constructed.

Desertification is one of the most serious problems facing the world today. Large tracts of the dry areas that cover more than one third of the earth?s crust are being degraded or are in the process of degradation, posing serious threats to environment.

The aim of this forest policy is environmental stability and ecological security through increasing vegetal cover which will lead to reduction in soil erosion and consequently dust particle in upper stratosphere. The reduction in stratospheric temperature is likely to increase the possibility of rains.

The economic activities in Nigeria clearly show that over 60 percent of the population are engaged in agriculture for their livelihoods directly or indirectly. However overtime especially in

Desertification is the process of land degradation in arid, semi-arid and dry-subhumid areas. This communication describes the classification system, methodology and the results of desertification and land degradation status mapping carried out for the entire country on 1 : 500,000 scale using multi-temporal
Resourcesat AWiFS data.

Trees and shrubs grew in the Sahara between 120,000 and 45,000 years ago, suggesting wet spells may have helped early humans as they left Africa.

Free-ranging horses (Equus caballus) in North America are considered to be feral animals since they are descendents of non-native domestic horses introduced to the continent. We conducted a study in a southern California desert to understand how feral horse movements and horse feces impacted this arid ecosystem.

In arid environments such as deserts, nitrogen is often themost limiting nutrient for biological activity. The majorityof the ecosystem nitrogen flux is typically thought to be drivenby production and loss of reactive nitrogen species by microorganismsin the soil.

Global warming risks from emissions of greenhouse gases (GHGs) by anthropogenic activities have increased the need for the identification of ecosystems with high carbon sink capacity as an alternative mitigation strategy of terrestrial carbon sequestration. The agroforestry sector has received recent attention for its enormous potential carbon pools that reduce carbon emissions to the atmosphere. The Nubra Valley (Trans-Himalayan region) is covered with more than 575,000 agroforestry plantations (willow and poplar). These species have been found to sequester more than 75,000 tonnes of carbon.

Original Source

International space missions have found ice on the moon and more evidence of ice on Mars -- good news for future settlements and also for scientists looking for extraterrestrial life.

Four reports published in Friday's issue of the journal Science show clear evidence of water, likely frozen, on the desert surfaces of both the Moon and Mars.

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