Prince William thinks the climate crisis has reached a “critical” stage. The 41-year-old royal has stressed the need to urgently address the climate crisis during an event in London for the Earthshot Prize, the environmental competition that he founded in 2019. William – who has Prince George, ten, Princess Charlotte, eight, and Prince Louis, five, with the Princess of Wales – said in a speech: “When I first started thinking about how I might contribute to the collective global effort to protect our planet in 2018, I knew that I wanted to mobilise the enormous power of innovators, wherever the…