Ahh, a golden oldie.
At first I thought maybe the story wasn't about Earth because they were looking at a green world, but then I remembered that in 1953 there were no publicized color images of Earth from space. Green was a pretty good guess though, rather close to blue.
Also, the trope-heaviness of this story irked me a little bit, but I kept reminding myself that this was before the tropes. This story and its kin helped shape the tropes (see what I did there?). Once I was able to overcome that hurdle I could sit back and enjoy myself (metaphorically speaking, I was jogging at the time).
I did particularly enjoy the Atomic Age -iness of the story. I always love reading stories written in the Atomic Age. It's such a clean, naive, quaint and adorable take on How Technology Will Advance Us And Perhaps Other Species. It's part of why I love the early Asimov stories much more than the newer stuff. But this made me wonder, in 60 years, will we be sitting around discussing the cute and naive stories of our era? How cybernetics, nanotechnology and the singularity didn't actually pan out as we blithely thought it would? I hope we all live long enough to find out.