Global warming threatens fertile land at the edge of deserts

Driving to school in Penzance contributes to desertification

Fertile land means that

Global warming causes the loss of fertile desert fringes because

A lot of countries in the Sahara are political unstable- this causes people to migrate to areas at the edge of deserts

Cities on the edge of Deserts are experiencing

The population growth results in more cultivation of the desert fringes

Growing the same crop year after year

Eventually the lack of nutrients results in no crop growth

With no plants the roots do not stabilise the soil and it

When populations grow in the desert fringes there is more need for firewood for cooking so

The removal of trees means that there is less shade and evaporation from the soil

With less shade the sun bakes the upper layer of soil,

Therefore when it rains the water

Not being able to drain the water runs across the surface and causes erosion of soil as gully form

Cattle herding of nomadic people has

Too many cattle results in overgrazing, loss of vegetation and

The extraction of minerals puts pressure on desert fringes- a mineral extracted in the Thar desert is

Tourism in the Thar desert is

Loads of tourism in one city has created problem is

The tourists have eroded the surrounding desert fringes by going on

Supplying water to desert areas is called

Irrigation of desert fringes is usually a good thing

However, in the Thar desert over irrigation resulted in salt in the soil dissolving and when it evaporated

Plants can grow in salt pans