Karen Hickman, a grassland ecologist at Oklahoma State University and president of the Society for Range Management, explained why the fires spread so fast, the risks to livestock and how quickly these ecosystems can recover.

Gettysburg has received relatively little attention, yet it occupies a unique space in these debates. The battlefield is one of the most hallowed historic sites in the country, and, unlike other areas with memorials to Confederate soldiers, is located in the North.

Backed by billions of dollars in venture capital and established aerospace giants that include Boeing and Airbus, startups across the world such as Joby, Archer, Wisk and Lilium are spearheading this technological revolution, developing electric vertical takeoff and landing (eVTOL) aircraft that could transform the way we travel.