In order for a woodland to successfully manage itself, it needs to be a vast wild woodland, of which we have none in Britain, or even Europe. Therefore, woodland management helps encourage healthy growth of vegetation and wildlife. It helps manage the light distribution, to ensure that light is still reaching the lower shrubs, to encourage growth. This also benefits woodland wildlife, as it ensures a continuous supply of food. In managed woodland, there are often more of a diverse range of tree species. This ensures that the woodland is more resistant to any environmental or natural changes, such as plant diseases, and thus helps to absorb more carbon dioxide, and reduce the impact of climate change.