Deserts are also not spared by the human population and most of the deserts are threatened by a combined effort by human exploitation and climatic changes happening all round the world. As per the studies at this rate many of the unique habitats and rare species will be wiped out from this world. Many are already not visible in this world because of the abuse human beings are doing on the deserts. Many of the semi-dry regions in the world are becoming increasing dry due to the climatic changes and this is making the life more difficult in the deserts which have been around for thousands of years.
Human exploitation of the desert are resulting in the drainage of underground aquifers and soil poisoning through salinisation. Aquifers are the body of porous rock which can contain or transmit groundwater. This is increasing the speed at which deserts are drying out and getting killed. Deserts are the richest area where rare animals and plants are found and more than 25% of the Earth is covered by deserts. The change is climate have and is changing the balance of the desert life which has been existing for more than 1000 of years. Because of the change in climate deserts are losing amazing landscapes and the culture which has been around for more than 1000 years and also the astounding wild species.
There are some deserts in the world which experience frequent bouts of rainfall because of the high temperature but majority of these deserts are becoming warmer day today. The strong solar radiation hitting the earth of the tropical belt creates off air currents and forms into dry winds to sub-tropical areas and this denies precipitation which makes them deserts. The deserts of African and American continents are formed due to dry inland conditions encouraged by outpouring of deep cold seawater caused by ocean coastal currents.
Climatic conditions are Responsible
The leeward sides of the mountain ranges which are divested of ocean generated moisture also form deserts. The climatic conditions like the rainfall patterns within the desert also are responsible for the climate outside the desert. When the desert surface is cold the moisture from the sea reduces and this cause the winter rains. When the surface is warm the moisture drawn into the atmosphere from the different sources reduces to generate the summer rains. The desert warming caused by the global climate change is capable of increasing the evapotranspiration. The effect of higher evapotranspiration, lower precipitation and protracted droughts will reduce soil moisture which is the limiting resource on desert productivity.
The increasing temperature will also affect the growth of grasses in favor of shrubs. The major cause of global warming is the increase in CO2 in global atmosphere and is also a major plant resource and the increase in CO2 encourages persistent species like annual grasses which are prone to wildfire. The wildfire eradicates shrubs and leaves the infertile desert soils. In deserts where there has not been any change in vegetation there will not be any storage of carbon in vegetation. The deserts soil is poor in organic carbon but rich in soil with inorganic carbon.