what the world needs the most is more people who understand that we all need to make an effort and contribute to make things better for everyone.
to get people to reach this understanding and be serious about it and also feel like they can actually have an impact, and more importantly have the hope that it will work and is not futile takes living by example and impress that on your family, friends and neighbors. then as your resources allow engage in the local community and show other that making a contribution is easy and worthwhile.
this way slowly there will be more and more people who will pick up this attitude until a critical mass is reached at which point solving otherwise huge problems (like climate change) becomes easy because the majority will be supportive.