Children around globe worry about education, food, environment: poll

''Their ideas for environmental solutions were encouraging: across the world, nearly half of children said they'd either plant more trees, build additional green spaces or decrease littering to help improve the planet,'' he said.

''Complex social problems affecting children are better addressed if children are part of the solution,'' he added.

Children from developing nations also differed sharply with those from developed nations when it came to career aspirations.

More than half of children in developing countries said they wanted to be a teacher or healthcare professional, while those in developed countries, whom Stirling noted often had the luxury of choosing a career, wanted to be a professional athlete.

But when asked, What are you most afraid of? the worldwide response was the same -- animals.