I guess what has the Global Warming folks in an uproar is what is shown on Figures 2, 3, 4, and 6 on your link. It is very clear on these Figures that after 1980 temperatures [the red line] continued to rise although the blue lines dropped back down. This is different from the previous 100 years, where they seemed to go up and down in tandem.
Following along the issue as I've been doing for years, there seems to have been a common view that the anthropogenic global warming signal perceptibly emerged from the noise of natural climate variability with the warming trend that commenced in the mid-1970s. Even though there will continue to be troughs and valleys (we're in a trough), unless something really drastic happens, the trend in temperatures will continue upward.