A recent study suggests the rise of McMansions has contributed to a loss of trees in Los Angeles:

Americans’ growing preference for large single-family houses, along with the increase in driveways and swimming pools that come with home expansion, is the largest driver of tree cover loss in the US, according to the study.

Looking at satellite imagery and data from the LA County assessor’s office, the researchers found about one-third of the city’s trees in single-family housing neighborhoods was eliminated from 2000 to 2009. During that period, tree cover may have decreased up to 55%…

Surprisingly, the researchers also found that 1950s suburban development may have been good for trees, at least in LA. Private land owners planted trees on their land during that decade, contributing to a richer urban forest in the city.

“These ecologically beneficial consequences occurred organically — not as the result of conscious environmental policy, but rather as an outgrowth of the cultural aesthetic and economics of the times,” the researchers write.

This leads to several thoughts:

1. Perhaps it is time to again modify Joni Mitchell’s “Big Yellow Taxi” to something like: “They paved paradise to put up a McMansion.”
2. Cities can often have a lot of trees. This may be counterintuitive: when people imagine cities, they think of skyscrapers and a concrete jungle. While there may not be many forests in the city, there can be plenty of trees.
3. With the praise given to ranch homes here, couldn’t McMansions reduce the issues by just planting trees? Those 1950s subdivisions didn’t have many trees at the time either – the classic images of Levittown often shows houses and bare land – and it took time for them to become the classic tree-lined suburban streets.