“The Doctor: The Fourth Great and Bountiful Human Empire. And there it is: planet Earth at its height. Covered with megacities, five moons, population 96 billion. The hub of a galactic domain, stretching across a million planets, a million species. With mankind right in the middle.[Adam faints]The Doctor: [leans towards Rose, still looking out over the Earth] He's your boyfriend.”

“The moon hung over the planet Earth, a dead thing over a dying thing.”

“Here are two facts that should not both be true: - There is sufficient food produced in the world every year to feed every human being on the planet. - Nearly 800 million people literally go hungry every day, with more than a third of the earth's population -- 2 billion men and women -- malnourished one way or another, according to the United Nations Food and Agriculture Organization.”

“I have a vision of a Galaxy overrun by mankind from Core to rim. Of four hundred billion stars each enslaved to the rhythm of Earth's day, Earth's year. I have a vision of a trillion planets pulsing to the beat of a human heart.”

“When viewed at the next quantum level of perspective, from which the Earth is seen as an organism and humans are seen as microorganisms, the human species looks like a menace to the planet. In fact, the human race is looking a lot like a disease -- comprised of organisms excessively multiplying, mindlessly consuming, and generating waste with little regard for the health and well-being of its host -- planet Earth.”

“We are here because over billions of years, countless variables fell into place, any of which could have taken another path. We are essentially a beautiful fluke, as are the millions of other species with which we share this planet. Our cells are composed of atoms and dust particles from distant galaxies, and from the billions of living organisms that inhabited this planet before us.”