Communities on the coast face "serious questions" against the background of climate change.
Read moreSea level rise
Scientists face some unique challenges working in the harsh conditions of the Antarctic.
Scientists are studying why the Thwaites Glacier is melting quicker than previously thought.
Matt McGrath
Environment correspondent
A new study shows that the absence of Arctic sea ice is linked to the melting of permafrost.
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Justin Rowlatt lands in a dazzling white and blue world to join scientists checking up on Antarctic ice.
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The Italian canal city's main square, waterbuses and schools are closed as the water rises again.
Read moreVenice has been hit by more frequent high tides, the BBC's Jenny Hill reports.
The damage from the 1.87m (6ft) high waters is a "blow to the heart of our country", PM Conte says.
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Over 80% of the city has been left underwater, leading the mayor to declare a state of emergency.
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A state of disaster is declared as the Italian city is hit with a high tide of more than 1.87m.
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