Today is World Health Day, a time to step back and ask if the world is becoming healthier. On some areas such as HIV/AIDS and malaria we are making progress. Yet we are falling behind in other areas such as maternal and child health. We are also ill prepared to deal with the negative health consequences of climate change - the theme for this year's World Health Day. Though it will be an issue for all of us, it will most severely affect the poorest of the poor. When it comes to public health, however, we are all in it together.