I have seen the argument shift from 'That's a lie. Global warming doesn't exist. Stop pushing regulations for a non-existent problem.' To 'Maybe it does, or there is some human impact but this is all within normal variation and the climate can take some amount of pollution so stop trying to regulate it!' to, I guess the new argument of, 'It's too late so why try? We shouldn't change course because it won't matter so stop trying to regulate the problem away.' It isn't too late. Do something.