Even if Donald Trump does not yet "believe in" climate change – there are millions of reasons for the fundamental transformation of the world’s energy systems to renewable resources. Millions of lives have been sacrificed on the altar of fossil fuels – and many million more are doomed if we will not make the switch to renewable energy world-wide. To work for peace means finally leaving the 20th century behind, a century of war and an age of conflict exacerbated by fatal energy systems. It is in our common interest to lay down arms and join in the struggle against our own inherited energy and resource dependencies.