The Earth's climate is changing.

Sonic tomography, or the use of sound waves to detect decay in trees, is a relatively new technology available to arborists.

Thousands of trees are struck by lightning every year. These trees will have varying degrees of damage ranging from complete shattering and destruction of the tree, to a slow lingering death, to virtually no apparent damage at all (Figure 1).

Conifers are commonly planted in North America to provide year-round screening, as windbreaks or as focal trees in the landscape.

Island systems are among the most vulnerable to climate change, which is predicted to induce shifts in temperature, rainfall and/or sea levels.

The history of the Morris Arboretum can be told through its eldest trees. Every scar and abnormality present on these immense specimens inspire awe, enrich visitor experience, and provide a glimpse into the past of the gardens.

Trees planted in cities face many survival challenges, but when they thrive they make our cities healthier, less hot, and more beautiful.

Improving urban forests is one of the solutions to achieving several of the United Nations Sustainable Development Goals and making cities healthier and more livable for people.

This tree plan, not only comprises a history of trees that once stood in the Park and catalogues the trees currently standing, but also directs the succession and maintenance of the tree canopy that future generations of Park users will enjoy.

U.S. urban land increased from 2.6% (57.9 million acres) in 2000 to 3.0% (68.0 million acres) in 2010. States with the greatest amount of urban growth were in the South/Southeast (TX, FL, NC, GA and SC).