The moral values of volunteerism should be encouraged. But it is even more important to understand and act on our ethical duties not to cause harm in the first place, or to benefit from it -- through the clothes we wear, electronics we use, food we consume and governments that we elect. Travel can help us to understand the seriousness of these connections. But the urgent work of addressing these harms needs to take place at home. It requires bright, committed, creative, energetic and compassionate people to act on the connections between our everyday lives and injustices in other parts of the world.