'“Our house is on fire” said Greta Thunberg who in 2018, all by herself, began regularly walking out of school to picket the Swedish parliament about the need for urgent action to hold back the climate crisis. Inspired by the March 2018 student-led March for Our Lives that, after the school shooting in Parkland, Florida, demanded gun control and generated huge further actions by students on this issue, Greta was thrilled when students responding to the climate emergency began to walk out of their schools in a growing number of countries around the world, with demonstrations calling for their governments to take urgent action on global heating.' (Introduction)