Time to 'get angry' teen climate activist says in Davos Sixteen-year-old Swedish activist Greta Thunberg arrives in Davos for the World Economic Forum and appears dead-set in her mission to spur action against global warming. She is demanding leaders do whatever it takes to adhere to the Paris climate agreement targets of limiting global temperature rises to well below two degrees Celsius (3.6 Fahrenheit) and beneath the safer threshold of 1.5C if at all possible. IMAGES of Thunberg's arrival AND SOUNDBITES from Thunberg