Back in 2004, a panel of world-recognized experts prioritised the challenges of the world, for the first time in history. the initiative came from Bjorn Lomborg, of "Sceptical Environmentalists" fame, a Danish statistician formerly deeply involved in the conservationist-environmentalist movement.
Lomborg developed an alternative vision and is now widely regarded as a serious, yet dissenting voice that brings new ideas to the table.
You can prioritize what you believe are the world's most important challenges here

This was Wacondah's list