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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 . The purpose of the expedition was the overthrow of the Bourbon monarchy of Sicily and Naples and the precipitation , by this act , of unification of the Italian peninsula . " The Piedmontese government was unwilling to allow so potent a symbol of revolution to return home , and Garibaldi remained in exile , in Tangier , Staten Island , and Peru until 1854 when Cavour , the Piedmontese prime minister , allowed his return with the purposes of separating him from Mazzini and the republican faction and of using his prestige and talents to further unification of Italy under the auspices of the Piedmontese monarchy . In any circumstances in Africa for now , the scenario of low coping capacities exists . Environmental sustainability was further integrated into overall economic planning in the region . The most serious problems confronting cities and towns and their inhabitants include inadequate financial resources , and planning skills and capacities . Many African countries have implemented air quality standards and pollution abatement regulations , but integrated planning and investment in infrastructure development remain priorities for urban areas . The high average incomes in the Policy Reform scenario and the Great Transitions scenario , combined with low urban populations , lead to very low total water pollution loadings . The spread of education for women , poverty-reduction programmes and widespread use of birth-control methods leads to a significant slowing in population growth rates in the Policy Reform scenario , and there is a radical reduction in growth rates in the Great Transitions scenario . Agriculture has long been promoted as a key sector for development and growth in Africa , and for pursuit of national goals of food security , rural income generation and export earnings . The collapse in society , polity and infrastructure in the Fortress World scenario underlies very sluggish growth in per capita income , which grows just barely over the rate of population growth over the scenario period . The Market Forces scenario assumes that world development evolves without major discontinuities , changes in values or other structural ruptures from the position as it existed at the end of the 20th century . In many countries , this observance provides an opportunity to sign or ratify international conventions and sometimes leads to the establishment of permanent government structures dealing with environmental management and economic planning . Urban planning – or lack thereof – can determine how well a city manages rising energy demands from transport and industry .