GEOG 3020 Lecture Notes - Lecture 4: Millennium Development Goals, Ecosystem Services, Ecological Network
22 Jun 2016
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Document Summary
Deforestation and biodiversity loss are examples of cumulative gec. Deforestation: globally, forests cover approximately 30. 6% of land in 2015 (down from 31. 6% in 1990, rate of loss is much slower than it was in previous decades. A positive sign that our attempts to better manage forests is improving. Reforestation rates are increasing: pressures on forests continue to relate to human population growth and the associated demand for food and land, impacts: Forests play an important role in the global climate system, acting as sinks for atmospheric carbon. Affect the hydrologic cycle slow evaporation of moisture from the soil and moisture from tree canopy evaporates and anticipates the formation of clouds and trees along river banks shade the water below, cooling it and slowing evaporation. Production of soil leaf litter and forest debris is broken down on the forest floor, feeding organic matter into the soil; tree roots break up heavy soils and slow erosion (moderating desertification)
