United Kingdom, Oct. 31 -- Prince William and Princess Kate have called for a "better, more sustainable world" in a new social media post.

Just after King Charles formally began the process of stripping Prince Andrew of his titles and honours, the couple, both 43, shared the message on their Kensington Royal X account as part of ongoing promotion for the Earthshot Prize, William's environmental initiative recognising global projects tackling climate change.

The post included a two-minute video highlighting finalists from Barbados, Bangladesh and the United States, describing how each is helping communities adapt to environmental challenges.

William and Kate wrote: "We envision a world that's a better, more sustainable home for everyone...