Drawing on the global experience of Oxfam, one of the world's largest social justice INGOs, this book tests ideas on 'How Change Happens' and sets out the latest thinking on how citizens and others can drive progressive change. The world committed to global transformative change in 2015, with the 2030 Agenda and targets in the Paris Climate Agreement to stay well below 2°C and achieve carbon neutrality by the second half of the century. We need to understand how change happens in order to accelerate our pathway to a safe future. Duncan Green's book is a timely and badly needed guide to bringing about the necessary social and political change.