How we cite our quotes: ("Story Name," Paragraph)
Quote #1
The rocket stood in the cold winter morning, making summer with every breath of its mighty exhausts. ("Rocket Summer," 5)
The Martian Chronicles starts with a very dreamy and beautiful image (we think) of a winter suddenly turning into a summer. But this isn't any kind of natural, season change—it's a violent, destructive technology, and it's just an accidental by-product of another kind of technology.
Quote #2
"We have superior weapons." ("The Third Expedition," 101)
Of course, those superior weapons don't help the Third Expedition. But notice how this particular type of technology makes the Earth Men feel safe on Mars. (Although it's funny that Mars doesn't seem to have its own diseases to kill Earth Men.)
Quote #3
"Because I've seen that what these Martians had was just as good as anything we'll ever hope to have. They stopped where we should have stopped a hundred years ago." ("—And the Moon Be Still as Bright," 212)
Spender argues that there was some time in the past when we were at peace with nature. We should have put a halt to our technological development then, just like the Martians did. It's kind of a strange argument to make, but he's probably right to question the benefits of technology. (Unless he's talking about our iPhones. No one's prying those away from us.)