Net carbon sinks capable of avoiding dangerous perturbation of the climate system and preventing ocean acidification have been identified, but they are likely to be limited by resource constraints (Nature 463:747-756, 2010). Land scarcity already creates tension between food security and bioenergy production, and this competition is likely to intensify as populations and the effects of climate ...

The latest scientific data confirmed that the earth's climate is rapidly changing. Therefore, it has been widely accepted worldwide that global warming is by far the greatest threat and challenge in the new millennium. The main factor that causes global warming is the release of greenhouse gases to the environment. In order to reduce the emission of these greenhouse gases and to promote sustain...

Natural resource endowments can determine a country's specialisation and provide it with an advantaged position in international networks, but they also lock into low value-added activities global value chains. Favourable weather soil conditions have made olive trees one of the most recognisable characteristics Mediterranean landscape for thousands years. Olive oil foods using related products ...

The growing population and increasing socio-economic necessities creates a pressure on land use/land cover. Nowadays, land use change detection using remote sensing data provides quantitative and timely information for management and evaluation of natural resources. This study investigates the land use changes in part of Hableh Rood Watershed of Iran using Landsat 7 and 8 (Sensor ETM+ and OLI) ...

Tropical deforestation is a significant contributor to accumulation of greenhouse gases (GHGs) in the atmosphere. GHG emissions from deforestation in the tropics were in the range of 1 to 2 Pg C yr(-1) for the 1990s, which is equivalent to as much as 25% of global anthropogenic GHG emissions. While there is growing interest in providing incentives to avoid deforestation and consequently reduce ...

[1] Accurate estimates of biomass are imperative for understanding the global carbon cycle. However, measurements of biomass and water in the biomass are difficult to obtain at a scale consistent with measurements of mass and energy transfer, ~1 km, leading to substantial uncertainty in dynamic global vegetation models. Here we use a novel cosmic ray neutron method to estimate a stoichiometric ...

4}} INTRODUCTION 1.1 Background. The major challenges facing Kenya today are poverty and unemployment. About 50% of the rural population and 30% of the urban population live below the poverty line. With 80% of the population being rural the poverty problem is overwhelming. The country has been unable to generate adequate employment and wage employment has been declining over the recent past. Wh...

May 2011, Vol. 101, No. 5 SAMJ Cannabis legal debacle To the Editor: The editorial in the SAMJ1 questioning whether it is time to decriminalise drugs refers. The Central Drug Authority (CDA) produced the South African Position Paper on Cannabis in 2004; however, the document was never made public or released.2 The Position Paper builds a case for prohibition on a ‘public health’ basis and osten...