In this treaty, nations agreed to “stabilize greenhouse gas concentrations in the atmosphere” to prevent dangerous interference from human activity on the climate system. In 1992, the UN organised a major event in Rio de Janeiro called the Earth Summit, in which the UN Framework Convention on Climate Change ( UNFCCC) was adopted. To keep it simple, COP26 is the biggest and most important climate-related conference on the planet. Let’s start with the basics, what is COP26? Here’s some answers we’ve found to the most common questions you might have about what’s coming up. “Without decisive action, we are gambling away our last chance to – literally – turn the tide”, UN Secretary-General António Guterres has said ahead of the meeting. In a world shaken by a pandemic, and a fast-closing window of opportunity to avoid climate catastrophe, the pivotal COP26 UN climate conference kicks off this Sunday in the Scottish city of Glasgow – the stakes could not be higher.