Jeff Bezos vows to give away most of fortune – and hands Dolly Parton $100m

Amazon founder wants to donate much of $124bn wealth to causes such as climate crisis and world unity

Jeff Bezos has promised to give away the vast majority of his $124bn (110bn) fortune during his lifetime, but admitted that ensuring that the most worthy causes benefit is proving as difficult as building his Amazon empire.

The 58-year-old, the world's fourth richest person, according to Forbes billionaires list, made the pledge after giving $100m to the country singer Dolly Parton to give to charities of her choice as part of Bezos's annual Courage and Civility award.