The drought is about to become the worst in 500 years

The remains of a warship used by the Nazis during World War II are once again visible in the Danube in Serbia.

The drought, described as Europe's worst in 500 years, has exposed the wreckage, which rests on the river bed.

- If nothing is done to reduce the emissions of greenhouse gases on a global level, such phenomena may become the norm already by the middle of the century.

This means that they can occur almost every year, says Andrea Toreti.

See more in the clip above.