Annotation:
I wrote "earth" non-capitalized since that's the way I feel that I see it more often for this kind of sentence.
"trees on earth"
https://www.google.com/search?q...es+on+earth%22
This shows a major newspaper like The Guardian using it this way, along with various published books (google book results).
See a comparison using books.google.com/ngrams/.
https://books.google.com/ngrams...0Earth%3B%2Cc0
BTW, "one of the" is a very high-frequenty 3-gram.
https://books.google.com/ngrams...e%20of%3B%2Cc0