And that is why helping farmers feed their own people - or nations educate their children and care for the sick - is not mere charity. It is also why the world must come together to confront climate change.  There is little scientific dispute that if we do nothing, we will face more drought, famine and mass displacement that will fuel more conflict for decades. For this reason, it is not merely scientists and activists who call for swift and forceful action - it is military leaders in my country and others who understand that our common security hangs in the balance.