Ozymandias thought so highly of himself that he had this statue built with that inscription to intimidate anyone who might come near it. He meant for it to be a warning to not try and invade or attack, the despair part is meant to be the person despairing because they could never be as great as Ozymandias.
The meaning is twisted though, as the statue crumbles with time showing that all leaders -- especially those who value themselves so highly--will fall.
He states that they are also part of the landscape that is meant to be admired and enjoyed. The people who work really and especially hard to preserve these parks also do not want them only for themselves. They are the vital part of the country that deserve to be recognized and appreciated.
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This is an example of irony:
Nothing is perfect. This was one of Mrs. Hopewell's favorite sayings. Another was: that is life! And still another, the most important, was: well, other people have their opinions too.
From the excerpt above, we see Mrs. Hopewell adding the name to the girl eventhough the girl feel that it's intrusive and she feel that she got to has a say about it. But despite that, Hopewell's favourite saying is other people have their opinions too.
The chemicals had caused the eruption of smoke that filled the air. (Not sure if this is 100%)
