A decade on from Cop21, the Paris agreement has delivered change, but keeping it on track is getting harder Ten years ago, in December 2015, tense negotiations were underway in France as delegates from around 200 countries acted as midwives to a historic moment. At the 21st conference of parties (Cop21), the Paris climate agreement was being finalised: a roadmap for tackling climate change with a commitment to limit global temperature rises to below 2ׄ°C.