...that is only the the answer to the question of whether natural or man made influences were greater over the last 150 years.
Sure. And the hypothesis of man-made global warming is that man-made CO2 emissions are the dominant cause of warming.
Only 52 per cent of respondents supported the hypothesis.
Since the IPCC only claims man-made emissions were the dominant factor after 1950, the question probably should have been worded better. But the questions and methodology were clearer than in any of the papers you cited that claim to support the fairy-tale "consensus."
And, frankly, even if you were to assume that all of the respondents who said it is a 50-50 split would have supported the hypothesis if the question had been clearer, that would still only add up to 62 per cent. Not a consensus.
Furthermore, the Netherlands Environmental Agency conducted a similar survey in April 2012 of scientists with expertise in this area that was specific to the post-1950 period. It found 66 per cent support for the hypothesis -- once again, not a consensus.
http://www.pbl.nl/en/publications/climate-science-survey-questions-and-responses
And it should be noted that both studies were done
before the major organizations that report on temperature trends had confirmed that there has been a pause in the Earth's temperature increases.
The "97% consensus" is a fairy tale. To the best of my knowledge (and I have read the studies cited on the NASA page), there has never been a survey that found any kind of consensus on the hypothesis of man-made global warming.