As a heat wave dries Germany’s rivers, government ministers are at odds over what to do about it: Re-engineer the waterways or restore them to their natural state.

Parts of the Rhine river in Germany could soon become unnavigable as water levels drop further due to soaring summer temperatures and low rainfall, an industry group warned Monday.

Parts of the Rhine river in Germany could soon become unnavigable as water levels drop further due to soaring summer temperatures and low rainfall, an industry group warned Monday.