Deforestation is the destructions of trees to make the land available for other uses. Deforestation leads serious ecological issues, amon which you can count: 1) global climante change, due to the trees are main part of the cycle of two green house gases: CO2 and water vapor. Trees absor huge amounts of CO2 emissions from fossil fuels and contribute to water vapor exchange. 2) Water scarcity: trees help to conserve humidity (keeping lower temperatures) and to the retention of water in the soils, when trees dissapear the sources of water decrease; 3) soill erotion: the roots of the trees help to keep the soil firm, and 4) species extinction: trees are houses four thousands of animals and organisms, with less trees and less water some species get lost.