An extra 23-33 eruptions (so far) may not seem like much, but those extra eruptions represent a massive amount of gases and ash being blown into the atmosphere. Millions and millions of metric tonnes which can have a profound effect on life on Earth.
The ash, which contains a variety of particulate matter, reflects sunlight back away from the surface. In severe eruptions it actually prevents sunlight getting through at all, as with the Mount Pinatubo eruption in 1992. Sulfur dioxide, one of the main gases thrown up during eruptions, also decreases temperatures and millions of tons at a time can be discharged when a volcano erupts.
If this level of vulcanism continues, which at this point looks likely, then we could be heading for a drop of a couple of degrees in temperature. Again this doesn’t sound like much, but a 2°C drop is enough to alter the agricultural zone charts in some areas. Climate scientists tell us that a rise of 2°C due to anthropogenic global warming (AGW) will be a disaster for mankind, yet they never mention what a drop of 2°C can do.