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To put it starkly , if we all try to free ride , we will all end up in free fall , with accelerating climate change the result of our collective failure to respond in time to this shared threat . They must also address the issue of corruption if they are to improve efficiency in utilization of resources , and they must embrace the democratic process for better governance . She published several volumes of " oracles , " or literary extracts , as " drawing-room diversions " with an educational benefit so that " the young may become familiar with something in an attractive form from the whole range of Poetry . However , Sofia Pedro refused to be a footnote of that devastating episode of nature in Mozambique , but a living symbol of the human spirit and resilience in the storm of an increasingly unforgiving hostile environment , which has changed dramatically over the past three decades . And so it is not only desirable , but pertinent , that Africans should create a sustainable environment for their current and future needs . " We will not solve this problem if we do not each take our share of the responsibility for tackling it . A certain level of BOD is always detected in water bodies , usually around two mg / l of oxygen , while higher levels of BOD could imply that the water is contaminated with bacteria and thus poses a risk to human health . " The account concludes : " His execution excited a feeling of horror all over Italy . Domestic , industrial and agricultural effluents are problems in most sub-regions , especially around large urban or industrial coastal centres , and in Western and Central Africa where commercial plantations are common in the coastal zone . The difficulties outlined above notwithstanding , the remaining sections of this chapter identify appropriate policy responses , analyse their implications and provide recommendations for action . If this is to be achieved in Africa , wider involvement of stakeholders is required , together with additional research and documentation . He , therefore , throws some of the live fish back into the sea so that they may continue to breed . In addition to the regional and sub-regional initiatives mentioned above , there have also been country level efforts , a summary of which is presented in Annex 1 . With a consistent health focus , over time people will better understand the risks they and their children are exposed to , and this will enable them to make better decisions about fuel use . The long-term character of the problems is daunting ; investment decisions will have consequences for infrastructure and energy systems that will stretch over many decades . Many cities still have concentrations above the WHO guideline , and some have been rising again in recent years ( OECD 2005 ) . In a national-level study , the US Environment Protection Agency ( US EPA ) , for example , projected the benefits of the Clean Air Act from 1990 to 2010 to be around US $ 690 billion . Shown here on a " sub-island " are several engravings pertaining to the events taking place around Rome during that time . This situation has to change if sustainability is to be achieved . It will show which of these scenarios has the greatest promise for the region over the next 30 years .