you can cross thresholds where it suddenly leaps, and it is very, very hard to pass back beyond those tipping points, thatis beyond those tipping points, that is the definition of them, changes and it stays for a long time. they are worried about those around a whole range of things, the melting of the greenland ice sheet is one of the ones they think may be past 1.5, there are a few people that think we have already passed that we may already have triggered long term melting of the greenland ice sheet which would raise sea levels around the world by seven metres, or 23 feet which has massive implications for urban cities on the coast and anybody living near the coast. near the coast. speaking of our waters 2023 near the coast. speaking of our waters 2023 very near the coast. speaking of our waters 2023 very hot near the coast. speaking of our waters 2023 very hot on - near the coast. speaking of our waters 2023 very hot on land . waters 2023 very hot on land but also in the oce