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Sea levels rose on average by 1.7mm a year during the 20th century. Since 1993 levels have been rising by 3mm a year, according to the IPCC. The average temperature of the oceans is also rising, and has increased by 0.10C over the period 1961-2003. Higher sea levels are partly explained by water expanding as it heats up and partly by melt-water from ice sheets and glaciers finding its way into the oceans. This rise in sea levels has obvious consequences for people living in low-lying coastal regions.
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Low-lying islands like the Maldives face an uncertain future
The Thames Barrier: London's defence against floods
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