Editor's note

Irma is one of the strongest hurricanes ever recorded in the Atlantic. Initially rated as “category five” on a scale from one to five, it has caused massive destruction and flooding across the Caribbean, leaving some islands barely habitable. And it could be a sign of things to come. Sally Brown warns that hurricanes might be getting more severe – and some could be so big that we’ll need to introduce a category six to describe them.

Meanwhile, Lauren Carruth looks at one of the biggest risks that follows natural disasters: cholera. She explains that the disease is now more treatable and preventable than ever, and that the places most at risk need the world’s help to stop it in its tracks.

Miriam Frankel

Science Editor

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Satellite view of Hurricane Irma. NASA

Hurricanes may be getting more severe – do we need a whole new category to describe them?

Sally Brown, University of Southampton

The scale from one to five that is used to measure the destructive power of a hurricane may no longer be enough.

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