> Can you see yet where this is leading us, and why I'm 120% sure that climate change WILL come with an increase in volcanic eruptions?

Melting of ice sheets on Greenland and Antarctica causing land to rebound (called iso-something shock IIRC?) which is likely to cause all kinds of tectonic activity such as volcanism. Which is less weight on the crust there, and so a lower local gravity in those areas. Gravity isn't strong enough to do much to even the thinnest part of the crust (about 16km in part of Antarctica apparently) directly unless you just mean it as weight, which is a weird way of using the term.