Climate change is unfolding amid the greatest information and communication revolution in human history. From e-commerce and social media to smart manufacturing and precision farming, digital technologies have become prevalent in all aspects of economic and social life. Digital technologies also have the potential to shape climate change action. Green digital transformation can help countries adapt effectively to the impacts of climate change and create greener growth pathways. Doing this means combining a focus on digital transformation and inclusion with a strategic and sustainable use of digital technologies to address climate change. Green Digital Transformation: How to Sustainably Close the Digital Divide and Harness Digital Tools for Climate Action illuminates the channels through which digital technologies intersect with climate change, and it proposes a path to low-emissions applications of digital technologies to help countries mitigate and adapt to climate change.