No one is denying that the report says there is SOME human contribution. That is a far cry from Primary causes. Co2 is only ONE "greenhouse gas" out of hundreds or thousands. Bush talked EXCLUSIVLY about Co2 releases since the industrial revolution. That is not a subject of debate on either side of the question. Co2 emissions have a direct and measurable human contribution. To say otherwise is a lie. Bush however, made NO assertion that GLOBAL WARMING had a significant human cause. You are mixing the context and trying to make it fit your own view just as the NYT did. They know the difference between so called greenhouse gasses and global warming but the gambled that us idiots out here would know the difference. Apparently some dont.
At least the author of that quote did a little CYA at the end. However, that does not matter because all that will EVER be covered by the press is the fact that the administration endorsed a report which stated that human activities have lead to an increase in Earth's temperatures. The press won't include that little caveat about "natural variability".