I am glad there are some figures out there about the amount of gardens which have been paved over in the last few decades. When I was younger all the gardens in my area had lawns and flower beds, now most of them are paved over. The article mentions the detrimental effects for birds but there are also impacts on other urban species. Hedgehogs are massively declining in the UK and the trend of paving gardens could be one explanatory factor. Hedgehogs mainly prey on earthworms and other macro-invertebrates, which are abundant on suburban lawns. You can therefore imagine how reduced hedgehog potential foraging areas have become. Not only that, the move from hedges to walls means that hedgehogs can move less easily between these foraging patches.
When people imagine a classic British front garden, they may first think of a small slice of well-tended grass. Perhaps with a box hedge. But over the past 10 years the number of front gardens with gravel or paving instead of grass has tripled, now making up a quarter of all houses, a survey for the RHS shows.