Posted October 14, 2018 12:05pm CST When is it time to remove a tree from your roof?

A new study published in PLOS ONE finds that while it may seem like a simple act, it can cause serious environmental damage.

A team of researchers from the University of Chicago’s Center for Sustainable Urbanism and the University at Buffalo’s Environmental Science Center looked at how urban trees affected the landscape of Chicago, which is home to more than 1.6 million people.

 They looked at the trees’ impact on the city’s air quality and its ability to hold carbon dioxide.

As it stands, the tree canopy covers a total area of about 9,400 square miles (25,000 square kilometers), the researchers wrote.

This amount of land is equivalent to more land than the United States has covered in the entire country’s history, the study found.

In other words, it covers more land per square kilometer than the entire continental United States.

As the trees cover more land, they release more CO2 into the atmosphere, and this is the primary reason that the trees are so important in controlling the carbon dioxide in the atmosphere.

A forest canopy is a complex web of interconnected structures that allow the air in the urban area to be monitored and controlled.

If trees are not placed on top of the ground, it will slow the movement of pollutants from the air and decrease the ability of the air to absorb CO2, according to the study.

So, while it is common to see trees growing on the roofs of houses and apartment buildings, the researchers say the study suggests that if the trees aren’t planted on top, then it’s likely that they will also affect the environment.

The researchers said they plan to publish a report that examines the effects of tree planting on the environment in the future.