When I visit somewhere like Knocking Hoe [last entry] I am always struck by the sheer number and variety of pollinators in action. Factors like pollution and climate change are undoubtedly a factor in the decline of pollinating insects but I think habitat loss is at the heart of the problem. 

 On a micro scale it's something individuals can do something about. A garden or a window box creates a habitat of sorts. Perhaps not a flowering chalk grassland like Knocking Hoe but a habitat none the less.