How does the red shift related to expanding universe

Astronomers observed that light from distant objects in the universe is redshifted (shift in the frequency of light towards red color), which tells us that the objects are all receding away from us. This is true in whatever direction you look at: all the distant galaxies are going away from us.

Ecological footprint is determined by measuring carbon dioxide emissions for a given region.

Your answer is water because there is combined mass of water found on, under, and over the surface of a planet. your answer is water.