It's 1000 years the future the earth is brooding along with the human damage also the CO2 levels are hard to walk around in and many need to be indoors some of the year. So they've decided to move the planet a little further out as it was a bit closer thanks to some battle for the earth to which the earth promptly joined an alliance something it was refusing to do previously that covered us as long as we didn't want any more from the ET group and kept ourselves to ourselves.
Anyway as all this has been going on a slug like creature has become photo synthetic and has become human size in it's evolution. it has arms, holds an upright posture and has transparent tissue over the rest of its body tissue that a bit absorbent of the sun so a tiny bit murky.
The funny thing about it is that the creatures which are slowly becoming more intelligent and who's average life span is going from 5 to 10 years of age is that they talk through burping.