She is said to have been one of the millions inspired by Sir David Attenborough's Blue Planet II.
Now the Queen has nailed her environmental colours to the mast by insisting the rest of her estates follow Sandringham's lead in banning plastic straws and bottles.
Buckingham Palace confirmed the new waste plan would apply to all of the monarch's estates.
A spojkesman at Sandringham said: 'Sandringham has for some time now been moving towards phasing out single-use plastics and using compostable, bio-degradable or recyclable packaging in the restaurants and shops at the Visitor Centre.'
Plastic bottles and straws will now gradually be phased out at all public cafes and resturants.
A Buckingham Palace source said that there was a 'strong desire' to tackle environmental issues at the highest levels of the Royal household.
More than 300m tonnes of plastic are produced each year. Some 10pc of it ends up in the sea, where it will outweigh the world's entire population of fish by 2050 if action is not taken to stem the tide.
Sir David made a strong case against plastic in Blue Planet II. In the final episode of the acclaimed series, he said: 'We are at a unique stage in our history.
'Never before have we had such an awareness of what we are doing to the plant. And never before have we had the power to do something about that. The future of all life now depends upon us.' The Queen is said to have become personally interested after working on a documentary with the veteran broadcaster about wildlife in the Commonwealth. They were filmed laughing and joking together during the making of the programme.
Prince Charles has also spoken about the damage done to our oceans by dumped plastic, warning recently of an 'escalating ecological and human disaster' caused by waste.
Britons are believed to use 7.7bn single-use plastic bottles a year. Fewer than half are properly recycled. The rest are thrown away.
Our seas are also at risk from micro beads used in some beauty products and so-called nurdles - the plastic grains used to make larger items. Both can be ingested by fish and other forms of marine life.
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