Britain's Prince William said on Wednesday that his wife Kate Middleton is doing "really well" and has been "amazing this whole year" after undergoing preventative chemotherapy for cancer.


The British heir to the throne is in South Africa where he will be hosting the annual awards ceremony for his multi-million-dollar Earthshot Prize in Cape Town. William made the trip without the Princess of Wales who is still recovering from her cancer treatment.


Prince William said Kate would be cheering him on from their home in Britain. "She's doing really well thanks," he told the BBC ahead of his environmental prize's awards ceremony in Cape Town. "She's been amazing this whole year. I know she will be really keen to see tonight be a success."


He said he hoped that their three children George, 11, Charlotte, 9, and Louis, 6, would also be watching the ceremony with pride at Windsor, saying they did what they could as a family to help the environment.


"Every family tries to do what they can to help with the environment and we go through the basics of recycling and making sure we minimise water use, turning lights off when you leave the house – we’re sensible with what we do around the environment. I think every family has those conversations," he said.


The Earthshot prize was set up by William in 2020 to find innovations to combat climate and other green issues. It was inspired by U.S. President John F. Kennedy's 1960s "moonshot" project which led to the 1969 lunar landing. Every year five winners receive 1 million pounds ($1.3 million) to drive their projects.


Responding to how he would convey his Earthshot message during a tough political climate for environmental causes, he told the BBC: "I think everyone wants some hope and wants some optimism."


This year's event is focused on ideas from Africa with over 400 African-led projects nominated and 350 others linked to the continent.


He durther said the young people of Africa attending the awards would show the importance the issue holds for them. "Without them, you know, the future is looking pretty bleak," he said.