Part of the On XXX series, “On Hope” is a pamphlet-length blast of vigor from Daisy Jeffrey, a core leader of the huge 2019 Australia Climate Strike rally (and its strikes). Unlike many of the On series, Jeffrey offers little stylistic complexity, instead we get an “in the moment” picture of a couple of years of feverish organizing amidst school work, culminating in a huge success. The very fact of this book, based on that event, gladdens the heart in these days of existential climate doom, but I also enjoyed her “fly on the wall” account of the hope-ridden but disappointing COP25 in Madrid. A useful and engaging chronicle.