Happy Birthday, br Greta Thunberg!.br Greta Tintin Eleonora Ernman Thunberg br turns 21 years old today.br Here are five facts br about the young br climate activist.br 1. She staged the first-ever br climate school strike in 2018.br 2. Thunberg refuses br to fly and sailed br across the Atlantic.br 3. Her speeches br are fact-checked br by scientists.br 4. She is the youngest br ‘TIME’ Person of the Year ever.br 5. Thunberg has been nominated br for a Nobel Peace Prize.