A family goes to mars to escape an atomic war. The father, Harry, begins to worry about all of the change while the rest of his family accepts it. He learns to deal with it and all of the humans on Mars turn into martians.
Technology and progress could lead to the end of human civilization
"Looking at the small white cottage for a long moment, he was filled with a desire to rush to it, touch it, say good-bye to it... leaving something to which he could never quite return, never understand again."
Dark They Were and Golden Eyed
"Onions but not onions, carrots but not carrots. Taste:the same but different.
"Being human is given. But keeping our humanity is a choice." - ???
The humans are turning into martians.
"But you must want to go back. Have you notice the peach blossoms, the onions, the grass."
The quote suggests that things are going to change for Harry which supports the author's message that technology could end humanization.
I think that setting supports it most because him saying he feels like he won't understand it anymore happens because he turns into a martian and is no longer human.
The quote reveals that the normal things are the same but different which develops the idea of change to humans and human things.
The quote suggests that Harry wants things to stay the same and he wants to remain human which supports the author's message that human civilization could end.