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One is pollution, which is why the humans had to leave earth. They had destroyed the planet. Another theme was life in space. The consequence of the humans being in space so long that their boned shrunk and separated from each other, this was caused by no gravity. The last theme importance of plants. The only reason the humans came back to earth was because walle found and gave the living plant to Eva and took it back to the ship which meant that the human race could survive on earth ounce again. In conclusion if the humans didn’t pollute the earth, they wouldn’t of had to go into space and therefor there would be living plants and trees to produce oxygen to make it suitable for