The vanishing face of Gaia : a final warning

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Lovelock first began thinking that the planet resembles a living entity in the 1960s, while working for a NASA project on how to detect life on Mars. While other scientists suggested elaborate tests involving space probes to check for microbes in Martian soil, Lovelock said to save the rocket fuel, we didn't even need to bother going there. Life, he theorized, would leave its telltale signature in a planet's atmosphere. There would be chemicals or elements that shouldn't be there but for the existence of something unusual, like living things. Anyone looking at the Earth from afar could tell right away that it had to harbour life because its atmosphere is loaded with oxygen, a gas so chemically reactive it shouldn't exist at all in any quantity. -- from http://www.theglobeandmail.com (Dec. 17, 2015)