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Appendix A. Pollution of environment (land, water and atmosphere) has increased rapidly since the onset of the industrial revolution. Population increase has placed much strain on the environment as have large-scale logging, mining and other commercial activities. Mining earns valuable foreign exchange but pollutes the environment, especially the water and soil through exposure to its discharge (treated or otherwise). Toxic heavy metals are present in this discharge and thus contaminate thedoi:10.1016/j.proeps.2013.01.036 fatcat:eb6z4lsxrzdgda3qkoxacpteq4