Dhruv Boruah’s mission is to inspire other people to solve problems facing the planet. What’s more, he gets them to come up with their ideas in just one day. But are their solutions any good and can they survive in the real world? Nick Holland went to Dhruv Boruah’s first solutions event in 2019. Two years on, he tracks down some of the people who were there to see whether anything came of their ideas.