I am not sure I would definitely say that volcanic activity is not linked to precession

But could the cycles have affected volcanic eruptions?
A new study published in Geology argues that they did. Previously, researchers have noticed correlations over limited time periods and regional scales, but the new work extends this to a broader picture, and appears to show a pretty strong link... the eruption spikes lag several thousand years behind the changes in tilt (and climate). That makes sense for sluggish crustal responses to changing conditions at the surface...
Source

The scientific community have been trying to answer that question for about the last 10 years.

As far as the second part, I believe that it is more important to talk about change vs weather temperature rises or falls. Indeed the temperature in the area that I reside has been colder than when I was a child. If you look at temperature maps for about the last decade and you see a blue dot in the middle signifying below average temperature, that is where I live. Speaking from personal observation, the crops on our farm were finally planted June 19. It has never been this late before (due to cold wet conditions). It is a maxim that crops must be in before the first of June. A statistic is that you lose a bushel per acre of corn production for every day past the end of May. In an area that produces roughly 100 bushels per acre, you can see that we are starting the season off already with a roughly 20% loss. This video shows an aggregation of the crop failures that are heading our way this year largely US numbers.

This isn't due to warming it is due to it being too cold and wet. Of course this can be attributed to changes in the jet stream pulling the cold air from the arctic which might be attributed to China's pollution.