i looked it up and that scientist was talking more hypothetically, he was talking to an audience or something to get them to think about the future, a bleak one that climate change brings forth. he wasnt 'saying we should', just that it could possibly happen because crops would be too difficult to grow. by 'conservative' i the word it was being used as its literal definition, rather than the political conservative, the context of the use of conservative was that eventually people might become more open to the idea of eating human flesh if it was implemented well enough, whittling down the long held belief that eating other humans is wrong