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Research on this subject has led to the conclusion that deforestation in Tanzania is not linked to issues of forestry alone ; it is intimately related to questions of public policies , and economic and social forces . In the mid-nineteenth century , British novels were most commonly published in three-volume sets , known as three-deckers , but also were serialized in periodicals and in " part-issue " as separate pamphlets . Marriage was of course impossible , and the correspondence dwindled once Burns left Edinburgh . It tells the moral tale of an orphan girl who learns " that vanity is not a venial frailty , nor self-confidence and love of distinction safe counselors , - - that nothing but a preferable love for the husband can sanctify the marriage bond , - - and that chastity alone will not make a good wife . More than once he cited the lines beginning " Dark as was Chaos " and elsewhere used the expression . It is necessary , therefore , to redefine sustainable development , actively focusing on the reconciliation of the environmental and socioeconomic objectives of development with an adequate consideration of the needs of present and future generations . Taylor , an early post-Romantic poet once well-known for his verse-drama Philip Van Artevelde , uses " maxims and reflections " to present " the immediate results of an attentive observation of life . Reading room hours are Monday-Friday , 8 a.m. to 4:30 p.m ., with the exception of major holidays ; we are also closed to readers between Christmas and New Year . Climate change-induced famine may result in more than 50 million environmental refugees in Africa alone by 2060 .