"I want much of my philanthropic activity to be helping people in the here and now - short term - at the intersection of urgent need and lasting impact," Bezos, one of the world's richest people with a net worth of more than $76 billion (59.57 billion pounds), said in a Twitter post.
The e-commerce executive has said he will sell about $1 billion of Amazon stock annually to fund his company Blue Origin, which aims to cut the cost of space travel and kick off entrepreneurship in the cosmos.
His family has also given more than $40 million to Seattle's Fred Hutchinson Cancer Research Center, not far from Amazon's headquarters.
Bezos has not joined them and 167 other of the world's richest people in pledging to give more than half of their fortunes to philanthropy.
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