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" ... Biology in the atmosphere could be the last surviving members of a prior Venusian biosphere, Stephen Kane, a planetary geophysicist at the University of California, Riverside, told me. Advanced climate models are certainly pointing towards a previously temperate climate for Venus as recent as a billion years ago, he says. ... "
" ... So it’s within this ecliptic that exoplanets with a direct line of sight view of Earth would be located. They will be the places able to see Earth crossing our own Sun, therefore providing alien observers a way to discover our planet’s biosphere. ... "
" ... The truth is, we need each other. We and the microbes need each other to survive and not enough humans think that way about our relationship certainly to those microbes but also to the rest of the ecosystem. We are a participant in a biosphere, not separate and distinct from it. When you have that kind of knowledge, it empowers you to think differently about your conduct and how you will use and exploit energy and what is your relationship to the rest of the animal and plant life on this earth. Without the wisdom of awareness of that relationship, we could end up destroying the very things that keep us alive, unknowingly and unwittingly. That would be the end of our species. ... "
" ... Would these alien civilizations know that we are here? If they are looking at the right time and the right place with a sensitive enough telescope - then, yes- for the last couple of billion years. “Signs of a biosphere in the atmosphere of transiting Earth, such as the combination of oxygen or ozone with the reducing gas methane, could have been detected for about 2 billion years in Earth’s history,” say the authors. ... "