Marsha Sanders set her paradoxically protected time portal first for 1920. Then 1907, and then 1862 as a means to stop a catastrophe that had infected Earth’s ecology irreversibly.

  She noted in her log:

  ‘This might take the rest of my life—someone will invent ‘the poison’ that destroys nature, but I must try. I realize this’ll drastically set back modern medicine, technology, manufacturing, electronics, and so many useful tools and fantastic inventions.’

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  Once Marsha arrived back from her journey, she stepped outside her lab, coughing, while she observed a brown-covered sky and nothing green.

  “No! Damn, all of you!”