Many United Nations Entities are leveraging innovative approaches ranging from data, artificial intelligence, drones and the internet of things, to low-carbon technologies, climate smart agriculture and nature-based solutions to help people around the world mitigate and adapt to climate change. This compendium explores these innovative approaches leveraged in the following areas: AIR; ENERGY; FORESTS; LAND; WATER; FOOD SYSTEMS; CITIES & LIFESTYLES; GREEN ECONOMY; DISASTERS & CONFLICTS; CAPACITY STRENGTHENING; ADVOCACY.