Prince Charles has urged world leaders to "think of your grandchildren, as I think of mine" as he demanded greater action to tackle climate change.
World leaders have gathered in Paris for the start of crucial talks on the subject.
Charles is due to give a speech to delegates on the protection of forests as part of the talks.
Police have fired tear gas at masked demonstrators in central Paris ahead of a major climate change conference taking place in the city.
Protests were banned in the French capital in the wake of the recent terror attacks, and a heavy police presence could be seen as security remained high.
At one stage, officers armed with riot shields could be seen dragging a man along the road by his legs away from the scene of a disturbance.
Around 2,500 demonstrations are being held across the world ahead of the COP21 summit, which opens on Monday. David Cameron will be among a host of world leaders to attend the conference, at which 195 countries will be represented.
Barack Obama's greatest struggle on climate change could be convincing the conspiracy theorists at home that it's not a hoax.
People across the globe have posed their questions for President Obama as he takes part in the UN Climate Conference in Paris.
The Prince of Wales said world companies 'pay no attention' to the damage their supply chains cause to forests.