Planet Earth is enduring the largest loss of life since the time of the dinosaurs, according to scientists. This loss is being driven by human behaviour, and governments are split on how to respond. At Cop15 in Montreal, many of these divisions will come to a head as they negotiate this decade’s UN biodiversity targets, known as the global biodiversity framework – or “GBF” if you are an insider. From the key players to what’s on the table, here’s what you need to know to make sense of the summit.