Old Ways Are Best!
1) Does Mining Guild give +1 Steel Production for each bonus when placing on a +2 Steel/Titanium bonus?The way I read it you get a +1 steel production bump every time you collect a steel or titanium bonus, regardless of the value of the bonus. And, you treated the PV/MS cards correctly.
We've treated this as +2
2) Do Protected Valley + Mangrove Forest give +1 or +2 oxygen/TR? ie: "Place a tile on an area ..." the rules say play it as normal (+1 oxygen +1 TR) ", and increase oxygen 1 step" - is this a 2nd oxygen/TR?
We've treated these as +1 because there's no separate oxygen symbol on the cards