Activists from the Greenpeace ship Rainbow Warrior hold flags from different countries during an protest at Kingsnorth coal fired plant, Britain's most controversial power station.
Coal is the most polluting of all fossil fuels and the largest single source of CO2 in the world. Currently, one-third of all carbon dioxide emissions come from burning coal. The Rainbow Warrior is visiting the United Kingdom as part of the "Quit Coal" tour in the North Sea.