Arguments For Externalism
Putnam presented a variety of arguments for the externalist position, the most famous being those that concerned Twin Earth. Subsequent philosophers have produced other, related thought experiments, most notably Donald Davidson's swamp man experiment. However, there have been numerous arguments for externalism that do not involve science-fiction scenarios.
Putnam pointed out, for instance, that he has no knowledge that could distinguish elm trees from beech trees. He has precisely the same concept of one as of the other: 'a deciduous tree growing in North America'. Yet when Putnam makes a statement containing the word 'elm', we take him to be referring specifically to elms. If he makes a claim about a property of elm trees, it will be considered true or false, depending upon whether that property applies to those trees which are in fact elms. There is nothing "in the head" that could fix his reference thus; rather, he concluded, his linguistic community, containing some speakers who did know the difference between the two trees, ensured that when he said 'elm', he referred to elms. Putnam refers to this feature of language as 'the division of linguistic labor'.
Read more about this topic: Semantic Externalism
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“Compared to football, baseball is almost an Oriental game, minimizing individual stardom, requiring a wide range of aggressive and defensive skills, and filled with long periods of inaction and irresolution. It has no time limitations. Football, on the other hand, has immediate goals, resolution on every single play, and a lot of violence—itself a highlight. It has clearly distinguishable hierarchies: heroes and drones.”
—Jerry Mander, U.S. advertising executive, author. Four Arguments for the Elimination of Television, ch. 15, Morrow (1978)