According to the government, current estimates show that one in six properties in Wales are at risk of flooding from rivers, the sea and surface water.

BBC: Environment Committee, afternoon session

The sea ice expanded during Southern Hemisphere autumn and winter in response to the development of a fresh, cool surface water layer, which floated on the denser, warmer salty sea water below.

BBC: Melt may explain Antarctica's sea ice expansion

The latest sea-surface height measurements reveal unusually cool water (shown as blue and purple) and sea levels that are two to seven inches below normal, extending from the Gulf of Alaska along the coast of North America.

CNN: satellite image

But the near-farcical playing surface, with the ball repeatedly held up in surface water, put Chelsea's passing game all at sea and Frank Leboeuf was almost caught out on the edge of his area trying to dribble clear.

BBC: Blues maintain Premiership push

It is a collaborative partnership of more than 30 nations from all continents, all working together to provide a seamless global array of over 3, 000 profiling floats moving up and down in the water column from the sea surface to 2, 000 meters and measuring temperature, salinity, and depth during every ascent to the sea surface.

UNESCO: Building the Wealth of Nations

The effect of these strengthened winds whipping across the sea surface is to bring deeper, more carbon-rich water up from below, thus reducing the surface layer's capacity to absorb more CO2 from the air.

ECONOMIST: Climate change

Deep water: area where surface waves are not influenced by the sea-bottom.

UNESCO: L O S S A R Y

And now the Arctic's upper layers are getting less dense, for several reasons: melting Arctic glaciers, rising surface-water temperatures, increased precipitation and an absence of salt concentrations resulting from sea-ice formation.

ECONOMIST: The science