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A study by the Spanish Oceanographic Institute says levels have been rising since the 1970s with the rate of increase growing in recent years.

It says even a small rise could have serious consequences in coastal areas.

The study noted that the findings were consistent with other investigations into the effects of climate change.

The study, entitled Climate Change in the Spanish Mediterranean, said the sea had risen "between 2.5mm and 10mm (0.1 and 0.4in) per year since the 1990s".

If the trend continued it would have "very serious consequences" in low-lying coastal areas even in the case of a small rise, and "catastrophic consequences" if a half-metre increase occurred, the study warned.