What chemical observation spurred Lovelock's initial hypothesis regarding Earth's atmosphere?

Answer

The coexistence of wildly out-of-balance, reactive gases like oxygen and methane simultaneously.

Lovelock observed that Earth’s atmosphere was in chemical disequilibrium, containing reactive gases like oxygen and methane together, which he viewed as prima facie evidence that life was actively sustaining the unique atmospheric cocktail.

What chemical observation spurred Lovelock's initial hypothesis regarding Earth's atmosphere?

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