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converting forest to grassland increases run off by
a factor of 27
predictions of a decrease in precipitation by
20%
Defrestation on average
17,500km2/year
since 1970
one fifth of rainforest has been degraded or destroyed
Tress make up
60% of all TRF biomass
Biomass of trees
165 t/ha
Biomass of soya cultivation
2.7 t/ha
soya cultivation aso reduces
input of organic matter into soil
increased run off
washes out nutrients from soil
Normally TRF HUGE SINK OF
2.4bn tonnes of carbon