here's our science correspondent victoria gill — her report contains flashing images. leaders came here to talk. but the criticism ringing in their ears is that when it comes to climate change, we've had far too much talk and nowhere near enough action. throughout this week's event, young climate activists — spearheaded by greta thunberg — moved from street protests to sharing the same room and the same stage with world leaders. there is no planet b, there is no planet blah. blah, blah, blah! today, they handed their proposals to those leaders, including a request to phase out fossil fuels entirely by 2030. in a couple of years, if this has to continue, if this chaotic approach to climate action has to continue, then we will lose our homes, we will lose our countries, we will lose our entire islands. the decisions that you make today have a lasting impact on our lives for tomorrow, so we need to see that our suggestions are being taken