What event could cause atmospheric oxygen to slowly be replaced with hydrogen, and what would the major effects of this be?

it doesn't have to cause too much mass extinctions. Some sacrifices are ok but not an apocalypse.

So it must be slow enough so living organisms adapt to it, but not slower than 1 billion years, it has to happen way before the sun enters its death phase and eats the solar system.

Second question

What would be the most evident and drastic changes in the environment and life on earth?

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What event could cause atmospheric oxygen to slowly be replaced with hydrogen, and what would the major effects of this be?

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