It is a potential threat for more than a billion, and possibly even as many as two billion, people. It is not just a matter of the Sahara spreading and such similar phenomena.
On potentsiaalne oht rohkem kui miljardile inimesele ja võimalik isegi kuni kahele miljardile inimesele. see ei ole ainult Sahaara laienemise või muu sarnase nähtuse küsimus.