“I’ve learnt you are never too small to make a difference.” 16-year-old @gretathunberg
started a movement to encourage school children to strike from school to raise awareness for climate issues. She's been nominated for the Nobel Peace Prize for her efforts If she were to win, she would be the youngest recipient since Pakistan's Malala Yousafzai, who was 17 when she received the prize. So far, there have been regular walkouts around the world, including in countries likes Germany, Belgium, the UK, France, Australia and Japan.
: The facts with David Attenborough is on tonight 9pm on @bbcone