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Using the same title as for the Kilmarnock volume , Poems , chiefly in the Scottish dialect , the Edinburgh edition appeared on April 17 , 1787 . In Southern Africa , loss of indigenous knowledge and inadequate protection of intellectual property rights are hampering conservation measures , as are overharvesting ( legal and illegal ) of medicinal plant species , rare and endangered plants , and " trophy " animals and exotic pets . Biological resources can and should be used to enhance economic growth opportunities , but consumptive and non-consumptive uses need to be managed with a long-term rather than a short-term view , and a fair and protective framework needs to be established to ensure that the benefits of resource use accrue to African communities and nations , rather than to international companies . These worsening economic conditions , and the economic stabilization and structural adjustment measures introduced in the 1990s to overcome them , resulted in considerable contraction of the economy , a decline in rural living standards , and a fall in income and employment ( Mogaka and others 2001 ) . The agriculture sector highlights perhaps more clearly than any other the extent and severity of potential impacts of climate change on food production , food security , lost livelihoods , environmental damage and environmental migration . Each system offers food production benefits but also has the potential to create environmental damage – both of which can be improved through effective policy responses .