Today, the converging scientific consensus makes clear that the collective impact of human life is profoundly altering the earth’s ecosystem and, in turn, imperiling the intricate web of life supported by it. We are bearing witness to climate change in extreme and erratic weather events, the melting of polar ice caps and rising sea levels. Religions for Peace General Secretary William F Vendley gives account of initiatives by RfP Worldwide in meeting the Challenge of Climate Change.