It is a once-in-a-lifetime opportunity to represent Hong Kong at this year’s UN Climate Change Conference, better known as COP27, but Carly Leung Pui-yee’s parents weren’t impressed by the news.

John Felix and Howard Leung Ho-yin, who opposed the motion. The Pui Tak team of Form Five students Sharon Ho Yuet-yee, Bonnie Lam and Bethany Tsang Yan-yee argued the affirmative side. James ...