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For development to be sustainable , the stock of national capital at any given time in the future must be greater than the current amount . Environmentally unsustainable and inappropriate practices , such as unsuitable agricultural methods , deforestation and water pollution , are the major humaninduced causes of vulnerability to environmental change . There are now over 117 000 protected areas worldwide , taking into account both those classified under any of the six IUCN management categories I to VI ( see below ) , and those not classified . World Environment Day is a people 's event with colourful activities such as street rallies , bicycle parades , green concerts , essays and poster competitions in schools , tree planting , as well as recycling and clean-up campaigns . Ethanol provided 44 per cent of all non-diesel motor vehicle fuel consumed in Brazil in 2004 , and was being blended with 30 per cent of all gasoline sold in the US ( REN21 2005 ) . His firsthand account , based partly on " notes taken and letters written at the time the events occurred , and partly from memory , " narrates his experiences in Europe with Shelley and Byron and their circle in 1822-1823 . 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 . Concerns for energy security , rising energy demand and costs , human health and the environment – particularly climate change – have all created a new impetus for change in the energy sector . The ride was coordinated by officials from the Federal Road Safety Corps . The production of the GEO Year Book was mandated by the 22nd session of the Governing Council , to highlight significant environmental events and achievements during the year and raise awareness of emerging issues from scientific research and other sources . As is often the case , increased poverty made people more reliant on natural resources to meet their daily needs or to generate income , and this increased pressure led to overexploitation of resources . Each year we include a range of available indicators , particularly including any that have been updated or which shed new light on key trends . Consequently , in looking at the future of Africa from 2002 to 2032 , we have combined all these efforts to produce quantitative descriptions and rich narratives of the various scenarios , which we believe will assist in the major steps that must be taken in the new millennium . She observes that this is " an extraordinary result for any private collection . Most of her novels were written in the 1830 's but not published till after her death . It is important to note that people in all regions in the world are vulnerable in one way or another to environmental change , but that their coping capacity is different . From 1861 to 1863 , following the death of Cavour , he served as prime minister of united Italy . Though to a modern reader her works may seem " imbued with all the worst traits of 19th century sentimentality , religiosity , and morbidity " ( DLB 42 , 323 ) , her poems and stories on home and family particularly appealed to young women and their mothers , and she meant her work as a vehicle for moral instruction as well as entertainment . Popular poetry of the mid-1800 's often took its themes from travel and historical subjects , as in this collection of poems inspired by the author 's Grand Tour of Europe .