Energy Observer, the first self-sustainable eco-friendly boat, travels on the Seine river as it leaves for a world tour, in Paris, France, July 15, 2017. The Energy Observer, a former racing boat converted by a team of nearly 50 engineers, designers and naval architects, will use a combination of a hydrogen fuel cell system, solar panels and wind turbines to sail throughout its voyage spanning 50 countries and 101 stopovers. (Photo/Agencies)
