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In an attempt to define human nature, I came up with the notion that human nature is based on instinct.  Instincts that drive our actions which are virtually programmed into us to ensure our survival in this world. Human nature is also based on adapting to our environment and being able to form our own opinions.  In a sense, human nature can be altered if it came down to a life or death situation and our need for survival trumped everything else.  The way we perceive things and decipher our thoughts takes time to develop and is constantly changing after we are exposed to new experiences and ideas.  Therefore I do not think Revkin should generalize and lump all humans under the term "human nature" because everybody lives by their own standard and is shaped differently by their encounters.  In order to change human nature, you would probably have to work with every single individual and even then, only persuasion may work since some people do not appreciate new ideas that are forced upon them.