Spare me your canned answers, kids. Granted, the question suux, but come on! Your world revolves entirely around junk food and boy/girl cooties/relationships, and not at all around using Google "to search for the peace." Please don't expect me to buy your moralizing about ending racism and reversing global warming. The world will never be "full of magic and fairy tales." As a matter of fact just your mentioning that has caused the Chinese/Tibetans/Israelis/Palestinians/Rwandans/Anarcho-Syndicalists to communicate with one another using American Sign Language even less often than previously. And after all those rainbows and flowers there was not one mention of homosexuality in any of your spiffy little ideals; don't the teachers who put you up to this think that fags might want to live "in a world where prisons are empty and churches are full" too? I wonder if there were ever any doodling crusaders for controversial issues, or if- ahem- Google just filtered them out before putting the entries up for voting. Either way, I can't help but notice there's no Google Doodle entry about "what if there was a world with no female genital mutilation."
Anyway this whole exercise seemed so censored and disingenuous it wound up exasperating the hell out of me, so I went back to the K-3 age group to try to get fucking real already. Long live the weird science-y kid who thinks it would be cool/possible for humans to live underground someday! I voted for this:
"What if we live inside the Earth also in the future. It will give us a lot more room. We can have air vents for oxygen, tunnels for transportation, food storages, drinking water generators. We can use a lot of energy from the Earth's core."
Runner Up goes to the kid who believes that people will all be happier if they can just rock out the way they like to rock out:
"I think that the whole world would be happier if they rocked out to the music they love."
Living Under the Sea is not a bad idea, but loses due to a lack of specific ideas regarding means of execution and to major demerits for cheesedick rhyming.
Winner for grades 10-12 is the kid who wondered what if "we distorted our flesh to the extent that so little remained of what made us human that we became but a twisted, robotic caricature of our former selves." Now that's what I call a plausible adolescent fantasy. The rest is all bullshit.