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Changing WorldAuthor: BBC While the effect of human activity on the global climate
is hotly debated, physical signs of environmental change are all around us.
Some scientists say an increase in the rate of melting of the world's glaciers is evidence of global warming. Argentina's Upsala Glacier was once the biggest in South America, but it is now disappearing at a rate of 200 metres per year. Other scientists say its reduction is due to complicated shifts in glacial
dynamics and local geology. Rising tides
Some scientists predict that a warmer climate will trigger
more violent storms, which will cause increased rates of coastal erosion.
This is a section of shoreline at in the USA, pictured in 1999 and 2004. The southern United States and Caribbean region were battered by a series of powerful hurricanes last year. Rising sea levels are also expected to speed up coastal erosion. Image: Gary Braasch ©
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