Climate protection begins with the built enviroment: the construction and operation of buildings account for 40 percent of all human-induced CO2 emissions worldwide. This book aims to show how we can plan and build in a climate-friendly way - from architecture to spatial planning. Intended to support the sector in moving towards climate neutrality, the encyclopaedia is an alphabetical compendium of individual tips. It is written so everyone can learn something - both lay people and professionals, because the climate crisis concerns us all.