The United Nations, in 2015, published 17 major issues that face humanity. Nearly two hundred countries signed on and pledged to work on reaching various goals pertaining to each of the 17 issues by the year 2030. The world is lagging behind where we need to be to reach the goals, but these are all something everyone of us can assist in!
Check out the UN Sustainable Development Goals (SDGs), and see what grabs your interest! Think about what you can do individually, locally, in schools or community groups, statewide or national efforts and organizations, and even joining in global efforts! There are numerous ideas at all scales listed on the UN website.