This week COP28 reached a "historic" and "unprecedented" conclusion to "move away from fossil fuels". While leaders are hailing the agreement a breakthrough, campaigners argue it doesn't go far enough and it should phase out fossil fuels entirely, but how realistic is that ambition? On this week's ClimateCast Tom Heap is joined by Sky's economics editor Ed Conway who explains why the answer to our fossil fuel reliance starts with a piece of Lego. They discuss what happens to fossil fuels now that deal is in place and what a net-zero 2050 might look like, and how we get there. Tom is also joined by Racquel Moses, CEO of the Caribbean Climate-Smart Accelerator, who speaks about the enormous impact the climate deal with have on small island developing states for decades to come. Producers: Emma Rae WoodhouseEditor: Paul Stanworth