然而，兰皮诺和其他人对传统主义者的一个基本假设提出了质疑：在整个地球历史中，冰川期是周期性发生的。
Yet Rampino and others question one of the traditionalists' basic assumption: the periodic occurrence of glaciation throughout Earth's history.
“我们并非建议地球上的每个人都成为严格素食主义者或者素食主义者”，他强调。
"We're not suggesting that everyone in the world become vegan or vegetarian," he emphasized.
理查德·李基是一名具有传奇色彩的自然保护主义者，他使用互联网把关心地球濒危物种的个人与战斗在前线的环保工作者沟通的桥梁。
Legendary conservationist Richard Leakey saw the Internet as a way to connect individuals concerned about the planets threatened flora and fauna with those working on the frontlines to save it.
几十年来，危言环境保护主义者一直警告说人类的厄运迫在眉睫，主要由于我们对于地球上自然环境系统的利用不可持续，且对其造成严重影响。
For decades, apocalyptic environmentalists (and others) have warned of humanity's imminent doom, largely as a result of our unsustainable use of and impact upon the natural systems of the planet.
当第一次地球日在1970年举行的时候，美国的环境主义者拥有足够的理由来感到内疚。
When the first Earth Day took place in 1970, American environmentalists had good reason to feel guilty.
荷兰人道主义者，伊拉兹马斯曾在卢万大学教书；地球仪的设计者，弗兰德地图制图学家——墨卡托，曾在那里学习数学。
The Dutch humanist Erasmus taught at the university; Mercator, the Flemish cartographer who projected the globe, learnt maths there.
18世纪启蒙运动和19世纪中的乐观主义者相信在全人类总有一天能够在地球上过上幸福和有价值的生活。
Optimists in the Enlightenment and the 19th century came to believe that the mass of humanity could one day lead happy and worthy lives here on Earth.
神秘主义者声称佛陀会在这时回归，帮助地球重生。
Mystics say that the Buddha returns now to help regenerate the Earth.
这仅仅是因为那些拯救地球的人长有脚而不是鳍状肢，他们呼吸空气而不是水，他们自称为绿色主义者而不是蓝色主义者。
Simply because those who would save the planet have feet and not flippers, and breathe air rather than water, they've called themselves greens rather than blues.
这仅仅是因为那些拯救地球的人长有脚而不是鳍状肢，他们呼吸空气而不是水，他们自称为绿色主义者而不是蓝色主义者。
Simply because those who would save the planet have feet and not flippers, and breathe air rather than water, they've called themselves greens rather than blues.
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