Examining love is like examining a stocking: if you hold it up to the light and stretch it to search for snags, any snags there are may well run and ruin the stocking. In fact, if I may fashion Coudert's law from Heisenberg's principle of indeterminacy, it is this: Love is not only changed by observation; it is changed for the worse.
Cities all over the world are getting bigger as more and more people move from rural to urban sites, but that has created enormous problems with respect to environmental pollution and the general quality of life.