2.2.4 Land Degradation
emissions will have to fall below the present
level in order to stabilise the atmospheric concentration of
CO2
Globally about 2000 million hectares of land have been degraded
- an area equal to more than one third of all cropland and forested land. Some
300 million hectares are under such severe stress conditions that damage can be
considered irreversible. If left unchecked, most of the remaining degraded land
is likely to reach similar conditions. Land continues to be degraded at rates
that are high by historical standards. The major causes of land degradation are
deforestation, shifting cultivation practices in agriculture, over-grazing and
the use of bush fires for short-term gains. Land degradation now affects the
lives of hundreds of millions of people and is hampering the development of
countries. Stopping land degradation is a high priority in many areas of the
world.
Although the production of energy (including biomass energy or
bioenergy) is not a major global cause of land degradation (although the impact
may be large locally and regionally), energy can play a major role in stemming
and reversing the problem. Specifically, the introduction of modern biomass
energy systems (e.g., for electricity generation) would put a sufficiently high
market price on biomass to make it profitable to restore many of the potentially
productive degraded lands to energy farm quality so as to be able to
serve lucrative biomass energy markets. Thus, the energy-land degradation nexus
appears more a cure than a
disease.