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Sir David Attenborough is the world's most-loved naturalist and has been broadcasting for over 60 years.

The presenter of Blue Planet and Planet Earth is known for his love of the natural world and for speaking out about climate change which threatens it.

The 93-year-old has spoken at the UN and criticised governments for inaction saying "the moment of crisis has come".

He's also famous for encouraging people to get involved with nature and help tackle climate change... so here's quotes from Sir David to make you think about nature and climate change.

Sir David's powerful message from Blue Planet

"We are at a unique stage in our history. Never before have we had such an awareness of what we are doing to the planet, and never before have we had the power to do something about that.

"Surely we all have a responsibility to care for our Blue Planet. The future of humanity and indeed, all life on earth, now depends on us."

Sir David on endangered animals

"The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?"

Sir David on humans

"It's extraordinary how self-obsessed human beings are. There is so much more out there than what connects to us."

Sir David on his love of Earth

"I wish the world was twice as big - and half of it was still unexplored."

Sir David on action on climate change

"Real success can only come if there is a change in our societies and in our economics and in our politics."