One fear of climate change is that more variable weather conditions will lead to violence and chaos in some places. But looking at it methodically, do erratic weather conditions actually lead to violent conflict and political instability? Not necessarily.

The eye catching headlines are familiar. “Water Wars” are imminent or already underway in the latest drought or dam-building hotspot. Such “wars” often extend to farmers battling over irrigation diversions, but at times countries are the players. Senior leaders are often quoted suggesting transboundary water theft constitutes a casus belli. Security officials are obliged to investigate.

As bad news continues to roll in regarding the accelerating impacts of greenhouse gases accumulating in the atmosphere, there is increasing discussion about imposing a carbon tax. Economists across the political spectrum support it, from Irwin Seltzer’s camp that remains “uncertain as to whether there is a global warming phenomenon” to William Nordhaus, who unequivocally views climate change as a threat.

In the late 1990s, world leaders came together to create the Millennium Development Goals – time-bound, quantified targets for addressing extreme poverty and human health and well-being. Notable among them was to “halve, by 2015, the proportion of the population without sustainable access to water and sanitation.”

Today, as El Niño-related droughts impact communities across East and Southern Africa, food aid shipment and distribution networks have shifted into high gear. From the U.S. Agency for International Development to the United Nations World Food Program and NGOs like CARE and Save the Children, food aid providers are stocking port warehouses in Djibouti and South Africa, as well as inland warehouses in countries like Ethiopia, Zimbabwe, and Lesotho.

“There are truly global-scale environmental challenges, and they need to be dealt with by thinking of solutions at the same scale,” said Thomas Lovejoy, a senior fellow at the United Nations Foundation, at the Wilson Center on June 29. The interaction between human population and environmental degradation is one of these challenges. [Video Below]

At USAID we recognize the threat poor sanitation combined with rapid urbanization presents to human health, dignity, and prosperity. This is why we have made urban sanitation a global priority for the Agency. During a recent visit to India, I was able to see some of the work being done to bring sanitation services to urban areas, and had the good fortune to meet some inspiring women who are advancing these efforts in their communities.

Susan Helms is a former NASA astronaut and retired member of the United States Air Force. During her time in the military, Helms flew over 30 different types of aircraft and received four Legion of Merit awards and three Defense Superior Service medals. She also holds the record for longest space walk and spent over 5,000 hours in space. She retired in 2014 with the rank of lieutenant general and now serves on the Wilson Center Board of Trustees. What did she learn over the course of such a distinguished career, much of it spent miles above the ground?