Only within the moment of time represented by the present century has one species -- man -- acquired significant power to alter the nature of the world.
Interpretation
Humans have gained the ability to significantly change the world around them in the current century.
In this quote, Rachel Carson emphasizes the unique position of humanity in the present century, highlighting that for the first time, we possess the capability to affect the environment and the natural world on a grand scale. This power comes with the responsibility to consider the consequences of our actions and to tread carefully as we shape the future of our planet.
In practice
In a speech about environmental protection, one might say, 'As Rachel Carson noted, only within this century have we acquired the power to alter nature significantly.'
As crude a weapon as the cave man's club, the chemical barrage has been hurled against the fabric of life - a fabric on the one hand delicate and destructible, on the other miraculously tough and resilient, and capable of striking back in unexpected ways. These extraordinary capacities of life have been ignored by the practitioners of chemical control who have brought to their task no "high-minded orientation," no humility before the vast forces with which they tamper.
Why should we tolerate a diet of weak poisons, a home in insipid surroundings, a circle of acquaintances who are not quite our enemies, the noise of motors with just enough relief to prevent insanity? Who would want to live in a world which is just not quite fatal?
To stand at the edge of the sea, to sense the ebb and flow of the tides, to feel the breath of a mist moving over a great salt marsh, to watch the flight of shore birds that have swept up and down the surf lines of the continents for untold thousands of years, to see the running of the old eels and the young shad to the sea, is to have knowledge of things that are as nearly eternal as any earthly life can be.
We cannot have peace among men whose hearts find delight in killing any living creature.
Until we have courage to recognize cruelty for what it is - whether its victim is human or animal - we cannot expect things to be much better in the world. There can be no double standard. We cannot have peace among men whose hearts find delight in killing any living creature. By every act that glorifies or even tolerates such moronic delight in killing, we set back the progress of humanity.
The more clearly we can focus our attention on the wonders and realities of the universe about us, the less taste we shall have for destruction.
I thought as I rode in the cold pleasant light of Sunday morning how silent & passive nature offers, every morn, her wealth to man; she is immensely rich, he is welcome to her entire goods, which he speaks no word, only leaves over doors ajar, hall, store room, & cellar. He may do as he will: if he takes her hint & uses her goods, she speaks no word; if he blunders & starves, she says nothing.
When we have learned how to listen to trees, then the brevity and the quickness and the childlike hastiness of our thoughts achieve an incomparable joy. Whoever has learned how to listen to trees no longer wants to be a tree. He wants to be nothing except what he is. That is home. That is happiness.
How can we be so arrogant? The planet is, was, and always will be stronger than us. We can't destroy it; if we overstep the mark, the planet will simply erase us from its surface and carry on existing. Why don't they start talking about not letting the planet destroy us?
I often visited a particular plant four or five miles distant, half a dozen times within a fortnight, that I might know exactly when it opened.
What other species now require of us is our attention. Otherwise, we are entering a narrative of disappearing intelligences.
A horse is freedom so indominable that it becomes useless to imprison it to serve man: it lets itself be domesticated, but with a simple, rebellious toss of the head-shaking its mane like an abundance of free-flowing hair-it shows that its inner nature is always wild, translucent and free.
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