Which is why the "global warming" crowd changed their name to "climate change."
But they haven't changed their claimed cause of the problem - carbon dioxide emitted by manmade causes.
The claims are so ridiculous now that all weather events, earthquakes and volcanoes are caused by global warming.
Volcanic activity, or lack thereof, are a confirmation of Global Warming.
If Volcanic eruptions are more frequent, this proves Global Warming. How? As the major water bodies heat-up, you get more moisture from the oceans, with warmer atmospheric temperatures, which causes surface temperatures to rise. As ice melts and waters runs off, tremendous amounts of weight are lifted off of Earth's crust. As the newly freed crust settles back to its original, pre-glacier shape, it can cause seismic plates to slip and stimulate volcanic activity.
If Volcanic eruptions are less frequent, this proves Global Warming. As the major land masses heat-up, you get less moisture from the oceans, with cooler atmospheric temperatures, which causes surface temperatures to fall. As water freezes, tremendous amounts of weight are placed upon the Earth's crust. As the newly frozen crust forms glaciers, it can cause seismic plates to stick and reduce volcanic activity.