June 27th-July 3rd 2020

The Economist PDF ePub mobi - June 27th-July 3rd 2020

The next catastrophe
In 1993 this newspaper told the world to watch the skies. At the time, humanity’s knowledge of asteroids that might hit the Earth was woefully inadequate. Like nuclear wars and large volcanic eruptions, the impacts of large asteroids can knock seven bells out of the climate...