Representatives at the Cop16 summit in Colombia negotiated against a backdrop of extreme weather and ecosystem collapseAs world leaders gathered in Colombia this week, they also watched for news from home, where many of the headlines carried the catastrophic consequences of ecological breakdown. Across the Amazon rainforest and Brazil’s enormous wetlands, relentless fires had burned more than 22m hectares (55m acres). In Spain, the death toll in communities devastated by flooding passed 200. In the boreal forests that span Siberia, Scandinavia, Alaska and Canada, countries were recording alarming signs that their carbon sinks were collapsing under a combined weight of drought, tree death and logging. As Canada’s wildfire season crept to a close, scientists calculated it was the second worst in two decades – behind only last year’s burn, which released more carbon than some of the world’s largest emitting countries.In global negotiations, climate and nature move along two independent tracks, and for years were broadly treated as distinct challenges. But as negotiations closed at the Cop16 biodiversity summit in Cali on Saturday, ministers from around the world underscored the crucial importance of nature to limiting damage from global heating, and vice versa – emphasising that climate and biodiversity could no longer be treated as independent issues if either crisis was to be resolved. Countries agreed