Nuclear weapons: who has them and how many are there? Try your luck at our interactive puzzle and find out...

Steer the Greenpeace inflatable boat around the seas and intercept the dangerous harpoons from the whaling ship. To make the whaling ship stop whaling, you must try and get your activists on board the whaling ship. Good luck!

Offshore wind alone could supply our electricity needs three times over. Make the switch to renewable energy by installing wind turbines on the designated hotpsots. Beat the clock and watch out for the floating oil drums - good luck!

On land, the UK contains 14 national parks but none in the surrounding seas. We have identified seven marine reserves in the North Sea - find out more about these proposed areas and some of its inhabitants with this interactive map.