Problems

Clear-Cut Logging

Clearcutting or clearfelling is a method of timber harvest in which all trees in a selected area are cut. There is no agreement upon the minimum area that constitutes a clear cut, but typically, areas smaller than 5 acres would be considered "patch cuts". The reasons for clearcutting can range from optimizing the regeneration of a forest to clearing land for other uses to taking every tree worth any money.
http://en.wikipedia.org/wiki/Clearcut

Desertification

The transformation of arable or habitable land to desert, as by a change in climate or destructive land use.

Deforestation

Deforestation is the conversion of forested areas to non-forest land use such as arable land, urban use, logged area or wasteland. Historically, this meant conversion to grassland or to its artificial counterpart, grainfields; however, the Industrial Revolution added urbanization. Generally this removal or destruction of significant areas of forest cover has resulted in a degraded environment with reduced biodiversity. In developing countries, massive deforestation is ongoing and is shaping climate and geography. http://en.wikipedia.org/wiki/Deforestation

Suburban Encroachment/ Urban sprawl

The unplanned, uncontrolled spreading of urban development into areas adjoining the edge of a city. www.answers.com/topic/urban-sprawl

Super-fund Pollution Sites

Superfund sites, which are uncontrolled or abandoned places where hazardous waste is located, possibly affecting local ecosystems or people. http://www.epa.gov/superfund/sites/