Greta Thunberg's Atlantic crossing: 'Why I wanted to help'

Nikki Henderson, who helped Greta Thunberg get to Madrid, reveals what happened on their 19 day journey.

Greta Thunberg's Atlantic crossing: 'Why I wanted to help'
Nikki Henderson, who helped Greta Thunberg get to Madrid, reveals what happened on their 19 day journey.