This landmark report brings together, for the first time, information on the state of Green Belt land and compares this to other areas of England. We provide evidence that the 1.6 million hectares of Green Belt provide a rich and varied natural environment and many related benefits to society. The ecosystem services provided by Green Belt land are highly significant and have an economic value that is often underestimated or simply not understood. We conclude that these areas could take on an even greater significance in the face of climate change, England’s growing population and the need for a low carbon economy. They can also help in creating a healthier society through providing space for active outdoor lifestyles and nutritious locally grown food.