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are [both] valid, but at different points along a rainfall gradient," Sankaran told Sci Dev. He added that while many savannahs are not necessarily under immediate threat, it is very important to understand what drives the coexistence of trees and grasses in different regions in order to help manage savannahs as climate conditions change.White House Correspondent (2008–2011) The Daily Rundown co-anchor (2010–11) NBC Chief Legal Correspondent (2011–present) Today co-anchor (2012–present) Macy's Thanksgiving Day Parade host (2012–present) Guthrie joined NBC News in September 2007 as a legal analyst and correspondent, regularly reporting on trials throughout the country.

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Savannahs — broad grasslands with scattered trees — are both economically important and ecologically unique.

During her time on Today, she has become known for her highly regarded interviews.

In 2011, she conducted an interview with Donald Trump in which he discussed his role in the Barack Obama "birther" controversy. Conrad Murray after he was found guilty of involuntary manslaughter in the death of Michael Jackson.

'Unstable' savannahs receive more than 650mm each year.

The amount of tree cover in such savannahs is determined not by rainfall, but by disturbances like fires and animals feeding.

In 2004, she became a national trial correspondent for Court TV.

She covered high-profile legal proceedings including the Senate Judiciary Committee confirmation hearings of U. Supreme Court nominee Samuel Alito, the abduction and murder trial of Carlie Brucia, the Martha Stewart case, and the Michael Jackson trial.

The balance between tree cover and grassland is crucial, influencing both plant and livestock production, and ecological systems such as the water cycle.

Now a team of researchers led by Mahesh Sankaran of the Natural Resource Ecology Laboratory at , Sankaran and colleagues report that savannahs fall into two types: 'stable' and 'unstable'.

Guthrie appeared as herself in the 2015 film Sharknado 3: Oh Hell No! In 2018, she played alongside compatriot Jack Sock in an exhibition tennis match against Swiss Roger Federer and American Bill Gates.

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