The water rich vs. the water poor. As the world population increases, and industry continues to expand, Earth's freshwater reserves are being stretched dangerously thin. See the disparity in water consumption between wealthy and underdeveloped nations.
Life Spans of the Animal Kingdom [Infographic - I love today's infographic. Simple, quick, pleasing color scheme and an interesting topic. I believe putting the lifespan of animals in perspective is something I haven't focused on since grade school.