Startup Idea : A website for discussing problems of this planet

A website where people can submit problems related to this planet or humanity in general (I mean real problems not something like - a social network for my dog, or a special nice to have device for my cat blah blah ..) and other people can submit answers. Next, people can vote on problems/answers, Most voted stuffs will be on top. (think of it like Hacker News, but instead of news, there will be problems and for comments, there would be solutions) Additionally, people can come together and solve the problems they are passionate about.