Alien and Dog pulled a WALL-E (one of my favorite movies) with a similar depiction of a future planet Earth. Our planet's future should be a major concern. There needs to be more balance and respect between human society and nature. However, I am left with a quote stuck in my head that I heard somewhere: "there is no profit in saving the earth." Sigh.
On another note, I feel Geel and Kevin's time travel capability is a bit of a gimmick (I also used it in this one)- I won't be using it often in cartoons.