joao fellet, bbc news. hm.imate change. the all—female group who have billions of fans around the world, have decided to speak outjust months before a major conference on climate change will be held in the uk. they spoke to our correspondent, laura bicker, in seoul. all: hi, this is blackpink! # hit you with that do—do, do—do, do! cheering and applause they're one of the biggest pop acts in the world, their videos are seen by billions and break youtube viewing records... this is a global challenge. each and everyone of us could make a difference, and we need to act now. ..so when they do a call to action like this, it can have a real impact. i think we all probably saw it but definitely, the documentary that sir david attenborough presented — a life on our planet — has helped us a lot and various other platforms such as that has helped us to actually learn more about what we could actually do to sustain our beautiful planet. basically, the documentary showed us how precious our planet is and how vulnerable it i