This week, ClimateCast is in Sharm el-Sheikh in Egypt where COP27 is reaching crunch time. Tom Heap looks at what the complications are around a potential deal on "loss and damage". A deal would see developed nations compensating developing countries for catastrophic climate events. It would be the first deal of its kind, but the details still need thrashing out.Tom speaks to leader of The Elders and former president of Ireland, Mary Robinson on what loss and damage means, what developing countries are asking for and what it would look like for indigenous communities. Plus he's also joined by Nigel Topping – who was appointed as a "climate action champion".Producers: Emma Rae Woodhouse and Alys Bowen Editor: Paul Stanworth