The world has a lot of dams-45,000 large ones, according to the World Energy Council, and many more at small scales. Its hydroelectric power plants have a generating capacity of 800 gigawatts, and they currently supply almost one-fifth of the electricity consumed worldwide. As a source of electricity, dams are second only to fossil fuels, and generate 10 times more power than geothermal, solar and wind power combined. With a claimed full capacity of 18 gigawatts, the Three Gorges dam in China can generate more or less twice as much power as all the world's solar cells. An additional 120 gigawatts of capacity is under development. One reason for hydropower's success is that it is a widespread resource-160 countries use hydropower to some extent. In several countries hydropower is the largest contributor to grid electricity-it is not uncommon in developing countries for a large dam to be the main generating source. Nevertheless, it is in large industrialized nations that have big rivers that hydroelectricity is shown in its most dramatic aspect. Brazil, Canada, China, Russia and the United States currently produce more than half of the world's hydropower.

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AGEING OUTLOOK THE COMING OF AGE A survey in England asked over 10,000 people aged 50 years and older to report their health status and any limitations with independent living. The survey found that the prevalence of health problems increases with age while people become increasingly dependent on healthcare and community support to survive. THE COMING OF AGE A survey in England asked over 10,000 people aged 50 years and older to report their health status and any limitations with independent living. The survey found that the prevalence of health problems increases with age while people become increasingly dependent on healthcare and community support to survive. Prevalence (%) 52-54 55-59 Age group (2011/2012)

GLOBAL SP EADObesity is a major risk factor for type 2 diabetes, cardiovascular disease and hypertension and has become one of the leading threats to public health worldwide 1 . GLOBAL SP EADObesity is a major risk factor for type 2 diabetes, cardiovascular disease and hypertension and has become one of the leading threats to public health worldwide 1 . OFF THE SCALEThe prevalence of obesity has almost doubled from 6. Middle EastChange in diets to more sugar, oils and animal products see obesity rates soar. BangladeshThe lowest rate of obesity in the world at fewer than 1% of adults. United StatesOne in three adults are obese.Western Europe 35% of all adults are insu ciently active. Mexico Cook IslandsThe highest rates of male obesity in the world at 60.1%. IN MO TAL DANGEHealth surveys in the United States between 1986 and 2006 of people born in a particular year, or 'birth cohort', reveal the risk of obesity-related mortality for four major demographic groups. The data shows that risk of death increases as a person ages from 60 years and will likely increase as younger cohorts with earlier onset age 5 . IN MO TAL DANGEHealth surveys in the United States between 1986 and 2006 of people born in a particular year, or 'birth cohort', reveal the risk of obesity-related mortality for four major demographic groups. The data shows that risk of death increases as a person ages from 60 years and will likely increase as younger cohorts with earlier onset age 5 .

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