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"As we approach the start of a new decade, the challenge ahead of us is clear and urgent.
"Climate change, human population growth, exploitation of natural resources, and habitat loss all pose major threats to the precious balance of our natural world," he said.
Winner of the 2019 Tusk Award for Conservation in Africa Tomas Diagne poses with Britain's Prince William in London.Credit:AP
William said his father, Prince Charles, had rung alarm bells about the state of the environment for many years.
"Right now, young people the world over are ringing that planetary alarm bell louder and with more determination than ever before," he added.
"My generation and those following are acutely aware that we cannot simply carry on as we are.
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"We have to move faster and more effectively to find ways to balance our demands on this planet with the nature we share it with."
The duke has been the patron of the Tusk charity since 2005 and visited its projects in Namibia and Tanzania last year.
Catherine, the Duchess of Cambridge was also scheduled to attend the event, but due to an undisclosed matter regarding their children, William attended alone.