These climatic zones in east Asia correspond closely to the climatic zones in North America. Environmental impact in the United States. The Norway and sugar maples are two widely planted street and ornamental trees throughout the eastern United States. The sugar maple, commonly known in the timber trade as the hard maple, is one of the most valuable trees in eastern North America. The Norway maple, an introduction from Europe, has become one of America's most widely planted street trees.
Early growth is fast, and the form and most other characteristics of the tree are desirable.
But the main reason for the popularity of the Norway maple is its ability to withstand adverse urban conditions, such as pavement, moderate levels of air pollution, dusts, and dry soil. The AG's potential impact on threatened or endangered species in the United States is unknown at this time. The AG is already the subject of considerable media coverage in Brooklyn. AG may be a controversial option, especially in urban settings. The public is also quite concerned about the situation as demonstrated by the large number, and wide distribution, of telephone calls received by the parks department after a recent news conference.