What it will do is flood the coastal areas.  It is already changing the weather pattern so that there will be more desserts.  What is going on in the Amazon is a drought right now.  The rain forest isn't raining any more since they cut the trees down. Other areas will be subject to atmospheric rivers which are the monsoons that will flood often.

When the southern ice cap melts it will raise the ocean 75 feet. There is already a 15 foot rise baked into the melt that is going on now.  We are going to see that rise start before we die. Things are speeding up much faster then was predicted just a decade ago.  

I have no clue what you are ranting about. The steam and ash probably has H2S in it and other gases that are in the magma.  

That particular volcano is a cinder cone in the Trans-Mexico volcano belt part of the ring of fire. It is located in a monogenetic volcano field system. The only thing you will find on the top of that cone is basalt rock.  There is something like a 1000 of those cones in that system. What happens in a system like this is magma follows a rift in what is called a dike until it comes to a weak spot then erupts into a fissure eruption. Then it forms a cone or shield until it runs out of magma source. Monogenetic volcano means it only will erupt one time.  It doesn't have a direct link to the mantle or a magma chamber underneath it.  The cones in this field are steeper then the ones that form in Iceland's Holuhraun Lava Field. There is one that is active right now in Holuhraun.