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Peter Yeung

The mesocosms were launched in the Gran Canaria port town of Taliarte.

Researchers in Gran Canaria take water samples from the mesocosms.

It's believed Marie Antoinette, who came to France from Vienna in 1770, introduced the croissant to the court of France, where it was later popularised by the baker Louis Ernest Ladurée.

In Paris, the age-old tradition of croissant-judging is upheld in the most serious terms: jury members for the Best Croissant in Greater Paris Competition are sent a comprehensive, 11-article document outlining the strict rules of the competition.