Princess Anne has explained why she supports genetically modified crops - despite her brother Charles being an outspoken opponent of them.
"They do add to our ability to perhaps be more efficient users of the land," she told BBC One's Countryfile.
"I think in the long-term, when you've got the prospect of nine billion [people] to feed, you are going to need some help in doing that."
Prince Charles once warned that the development of GM crops risked creating "the biggest disaster environmentally of all time" and accused multinational corporations of conducting an experiment with nature which had gone "seriously wrong".
Rock star Brian May led around 2,000 animal welfare supporters - some wearing badger masks - in a march through central London today as they called for the Government to abort plans to cull thousands of badgers.
Thousands of people decked in black and white clothing have marched on Westminster to call for an end to plans for a badger cull.
Rock star Brian May led around 2,000 animal welfare supporters - many wearing cardboard badger masks - as they chanted "stop the cull" in protest at pilots in west Gloucestershire and west Somerset - two bovine TB hot spots, due to start from today.
The pilot culls aim to ensure free-running badgers can be killed humanely, with marksmen observed by independent experts to check they are killing the protected animal swiftly, and post-mortem examinations carried out to assess speed of death.
Queen guitarist Brian May has renewed calls for the Government to abort plans to cull thousands of badgers in an effort to tackle bovine TB.
May said: "The great bit of new information is it has now been demonstrated that the cull cannot make economic sense. It will lose the taxpayer money rather than save it.
"That was really the last shred of reason that you could give for this cull going ahead. It is a very good time for Mr Cameron to reconsider and withdraw from this monstrous cull, in the public interest.
"Our point is to save wild animals from abuse and there is no doubt this cull is going to cause intense pain on a massive scale to badgers. You cannot call it humane, which is apparently what these pilot culls are about.
"It has become increasingly apparent to me that, although we call ourselves a nation of animal lovers, we treat them appallingly".