More than 15,000 people worldwide contributed to the survey, which was held online between May and September 2020, and made available in 25 languages.
Respondents were mainly young people, with 57 per cent under age 35, and 35 per cent under 25. Results also were analyzed along regional, gender, age and other demographic lines.
"Greater efforts are needed to address people’s specific concerns, and multilateralism is the way to do this. Restoring confidence in multilateralism requires the implementation of concrete and impactful projects, and this is at the heart of our Organization's role," said Audrey Azoulay, the UNESCO Director-General in a press release on Wednesday.
The World in 2030 survey invited people from across the globe to share their specific worries about 11 challenges, and solutions for overcoming them.
Most participants, or 67 per cent, selected climate change and loss of biodiversity as their top concern, mainly due to issues such as increasing natural disasters and extreme weather.
Respondents felt investment in 'green' solutions, education on sustainability, promoting international cooperation and building trust in science, were the best ways to address the issue.
Violence and conflict, discrimination and equality, and lack of food, water and housing were other big challenges, the survey revealed.
Participants believed that overall, more education was the crucial solution to every single challenge.