Leonardo DiCaprio has wished Sir David Attenborough a happy birthday. In a heartfelt post on Instagram, the Oscar-winning actor and environmental campaigner joined royalty and other stars in celebrating Attenborough’s 100 years on the planet. “Happy 100th birthday to Sir David Attenborough — a storyteller, naturalist, and one of the most enduring champions of our shared planet,” DiCaprio wrote. “For as long as I can remember, Sir David has opened windows into the natural world, bringing moments of wonder, beauty, and discovery into homes across the globe and inspiring generations to fall in love with life on Earth. Through his voice, many of us first came to witness the astonishing richness of biodiversity — and to understand both its fragility and its resilience. “At 100 years old, his legacy is extraordinary. He has reshaped global awareness of conservation and reminded us, time and again, that protecting nature is not optional — it is fundamental to our future.…