Teenage climate activist Greta Thunberg, who came second on the list, was the youngest candidate, aged 18.
The search also found several royals placed in the top 10, including Prince William, Prince Charles and Kate Middleton.
But Prince Harry and Meghan Markle didn’t prove as popular in inspiring our great nation, ranking eighth and 25th respectively.
A spokesperson for Utilita, the energy supplier behind the green listing, said: “David Attenborough has done so much for this planet.
“For decades he has graced our television screens and educated the nation about the beautiful wildlife that surrounds us; he has made a huge difference.
“But Mother Earth needs the same from all of us – we all have the same responsibility to care for our planet.
“And it’s important to note that every little action makes a difference; it all adds up.”
Elon Musk, founder of electric car maker Tesla, ranked 17th on the list, while eco-warrior and actor Leonardo DiCaprio came seventh.
It also emerged that three in four adults agreed it was important for personalities to be kind to the planet, with 55% saying it’s because they need to lead by example.
And 61% said public figures are just as responsible as any other individual.
In fact, nearly a quarter of those surveyed are more likely to change their habits and be more durable in replicating what a celebrity has done.
And a third have been inspired, at one time or another, to change their lives after witnessing the actions of a public figure.
The study, conducted via OnePoll.com, also found that 71% think it’s easier for celebrities to be sustainable because they have more money.
But 83% said the personalities were also making a huge contribution to the climate crisis, with 77% saying they could do more than they already do.
Despite agreeing that famous faces could do more, 49% of UK adults said they could make more changes themselves.
Only three in ten think they are doing everything they can.
Unplugging unused electrical appliances, lowering the temperature of a wash cycle and repairing broken items instead of replacing them with new ones are among the most common environmental actions of Britons.
The spokesperson for Utilita, the energy company created to help households use and waste less energy, added: “We are all equally responsible for taking care of our planet and preventing further damage.
“It’s important to recognize that we all make a difference, whether it’s seemingly as small as turning the heat down a degree, or something that requires a bigger investment like installing solar panels on your roof, everything adds up.
“Celebrities are another powerful voice that can help pave the way for a greener future.”
TOP 30 MOST INSPIRATIONAL CELEBRITIES:
- David Attenborough
- Greta Thunberg
- Prince William
- Prince Charles
- Joanna Lumley
- Kate Middleton
- Leonardo DiCaprio
- Prince Harry
- Dr. Jane Goodall
- Al Gore
- Jamie Olivier
- Stella McCartney
- Angelina Jolie
- Arnold Schwarzenegger
- Emma Watson
- hairy bikers
- Elon Musk
- Cameron Diaz
- Deborah Meaden
- Gwyneth Paltrow
- Drew Barrymore
- Daryl Hannah
- Lucy Watson
- Meghan Markle
- Rosario Dawson
- Jaden Smith
- Cate Blanchett
- julia robert
- Zac Efron