The Council for National Parks wants businesses to accept they have a duty to look after green spaces.
The first of Britain's national parks were established in the 1950s and some have become victims of their own success.
On Exmoor and in the Lake District tourism leads to roads being choked with cars in summer. Quarrying in the North York Moors and the Peak District has resulted in the removal of entire hills. The Council for National Parks says destroying the landscape just to provide hardcore for building roads should no longer be tolerated.