On 4th October, Pope Francis announced Laudate Deum. A follow up to Laudato si.
Laudate Deum can be downloaded can be downloaded from the Laudate Deum webpage https://laudatedeum.church/

Laudate Deum gives a stronger message on climate change, "I have realised that our responses have not been adequate, while the world in which we live is collapsing and may be nearing the breaking point." LD2
Laudate Deum is not a replacement for Laudato si. The original encyclical can be downloaded from https://www.vatican.va/content/francesco/en/encyclicals/documents/papa-francesco_20150524_enciclica-laudato-si.html