It was against the law for anyone to go without at least one good meal every day. Hunger was abolished. Pharmaceutical companies were ordered to research the worst diseases of humanity. They were no longer to waste time and money on lifestyle drugs, health became the priority. Big-city gang members, not only well-known by the police, but also not terribly secretive when it comes to advertising their gang affiliations, were rounded up worldwide, taken to their respective countryside, shot, then buried in mass, unmarked graves. This radical exercise worked to discourage future gang formation. The killing of animals for sport or profit, especially those on the brink of extinction, and the abuse of domestic animals was punishable by death; euthanasia, it was called. A moratorium was placed on all logging endeavors, no matter how small. Habitat loss was considered particularly heinous, its contributors were summarily executed. The ecosystem as a whole-unto-itself suffered from a bottom-up perspective. Procedures and protocols were put in place to correct the situation. Bureaucracy transformed almost overnight into a system impressed with fresh conduits of information transfer, social engrams that superseded previously ingrained manners of thinking and behaving.
Polluters of air and water were forced to breathe and drink the poisons they dumped into the environment; the worst corporate offenders were simply shut down; the days of the token fine were over. Recalcitrant leaders of industries deemed detrimental to the health and well-being of society were put to death on public television. This seemed to encourage others to clean up their act.
After it was discovered that poor nutrition--the result of toxically tainted food caused by irrigation with polluted water--was the main cause of cancer, heart and liver problems, brain tumors, and serious mental disorders--those that inevitably lead to violence--the quality of water became the highest of priorities. When the social ramifications of continued neglect of this life-sustaining resource--like war--were demonstratively realized, technologies to purify and protect it rapidly developed.
He instituted other controls as well, and everyone did as he requested; he was that charming and persuasive. It should be noted, however, that his people back on Xulcatur in the Andromeda Galaxy have the capacity to rearrange the interconnections of synapses in the brains and hence minds of lower-ordered sentients. During the Golden Age of exploration, his race had recourse to use this ability on many confused, ignorant, and volatile populations in order to gain cooperation, for their own good. On Earth, he applied this talent to its fullest potential, greatly enhancing his persuasiveness.
As well, his race had long since gone through its adolescent stage, past middle adulthood, and into the space of genuine understanding. Life, to them, was to be lived and enjoyed for its own sake, and this level of appreciation was to be spread around and the importance of the message instilled from birth. The inclination and predisposition for strickly self-centered action that denied the inherent value of others--sociopathy--had been neutralized over successive generations by natural selection. Like a tree across the road, advanced common sense prevented preying on, exploiting or bullying others in much the same way that a normal person would balk at deliberately dropping a heavy object on his foot. Only a moron would do something like that; consequently, morons were systematically eliminated from the gene pool.
It was his intention to do the same here, on Earth. Everybody with a brain in his head agreed.