The pie chart indicates the major causes why farmland becomes degraded, while the table illustrates how these factors affected North America, Europe and Oceania during the 1990s.
Overall, the primary cause of land degradation is over-grazing. Europe had a higher proportion of unproductive land than the other two regions in the 1990s.
Around 35%, farmland is degraded because of over-grazing. Deforestation causes about 30% of unproductive land, while the percentage of degraded land due to over-cultivation is slightly slower at approximately 28%. Other causes accounted for only 7%.
Coming to the second table, about 23% of Europe’s land became unproductive and the main reason for this was deforestation. Degraded land in North America accounted for a very small proportion, only 5%, and over-cultivation was the main cause. This figure for Oceania was higher, about 13%, and the majority of land in this region was degraded due to over-grazing.
The pie chart indicates the major
causes
why farmland becomes degraded, while the table illustrates how these factors
affected
North America, Europe and Oceania during the 1990s.
Overall
, the primary
cause
of
land
degradation is over-grazing. Europe had a higher proportion of unproductive
land
than the other two regions in the 1990s.
Around 35%, farmland
is degraded
because
of over-grazing. Deforestation
causes
about 30% of unproductive
land
, while the percentage of degraded
land
due to over-cultivation is
slightly
slower at approximately 28%. Other
causes
accounted for
only
7%.
Coming to the second table, about 23% of Europe’s
land
became unproductive and the main reason for this was deforestation. Degraded
land
in North America accounted for a
very
small
proportion,
only
5%, and over-cultivation was the main
cause
. This figure for Oceania was higher, about 13%, and the majority of
land
in this region
was degraded
due to over-grazing.