Narrow structures extend into the blue water like docks; small white dots break up field of blue like ships on water; and the structures lining the area resemble large warehouses.

The researchers gave 14 healthy volunteers either green tea, diluted caffeine or hot water and then measured the function of endothelial cells lining the circulatory system.

Scientists warn the wetlands are losing the lining that once retained water, with deep cracks opening up in the worst areas.