Sentences with phrase «percent of the urban tree»

In southern California, for example, the invasive shot hole borer has killed thousands of city trees and poses a threat to 33 percent of the urban tree population in the region.

Not exact matches

One factor is that researchers have found warmer temperatures increase the number of young produced by the gloomy scale insect — a significant tree pest — by 300 percent, which in turn leads to 200 times more adult gloomy scales on urban trees.

In the megacities that are home to nearly 10 percent of the world's 7.5 billion people, trees provide each city with more than $ 500 million each year in services that make urban environments cleaner, more affordable and more pleasant places to live.

Overall, the researchers estimate that urban areas lost a collective total of 1 percent of their tree cover in five years.

Urban trees are a lifeline to nature not only in Seattle, but for the majority of residents in the United States, where 80 percent of the population lives in urban aUrban trees are a lifeline to nature not only in Seattle, but for the majority of residents in the United States, where 80 percent of the population lives in urban aurban areas.