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Deforestation also affects climatic conditions reducing rainfall and run-off at the micro level ( thereby also impacting on freshwater availability and aquatic ecosystems ) and contributes to global warming and its impacts at the macro level . This biography , by Smith 's daughter , includes excerpts from lectures , sermons , speeches , and letters . The passage reproduced shows Tennyson 's poetic response to Lyell 's Principles of Geology and includes two stanzas ( the second and the fourth ) not included in the final published text , as well as other variants in the third stanza . There are incidences of this in Africa , including promotion of the energy sector and urban development , with a risk of overexploitation of forest resources ; promotion of the agriculture , mining and infrastructure sectors , leading to woodland and forest clearance ; and promotion of industrial and manufacturing sectors , which generate wastes and pollutants that undermine environmental quality .