Forgive the harshness.....what you're saying is like waving a red flag in front of a bull......here's the wind up.....and the face punch is coming.
OP: Go for it....if you're already rich enough to take a course of study in a new, nebulous "luxury" warm fuzzy field.
If you have to borrow money or even have to bust your (or your parents) ass for tuition, skip the bullshit new fluff degrees and go for a degree that "closes the business case" and has a concrete, measurable ability to positively improve the world. Engineering at an in state, state school, after doing your first 2 years a community college is an example of a degree (and how to go about getting it) that will "close the business case".
If you want to ACTUALLY do something for the environment and humanity (and in something that is also a good career field), try Civil Engineering and then go into waste water. Believe it or not, there are still first world cities (cough, cough - Victoria, British Columbia, to name the local cheapskate bastards) that pour untreated shit filled sewage laden with all kinds of nasty bacteria, etc into the ocean, while Seattle (not too far away) goes for full on secondary treatment. Right across the Strait of Juan de Fuca from Victoria is Port Angeles, WA, they have a secondary treatment system, to provide a direct compare and contrast where there are 2 cities both fronting on the Strait.
https://www.cityofpa.us/pwWasteWtr.htmAnd to the local Victoria folks who claim the current system isn't bad - why don't you set some crab pots within 1/4 mile of the outflows....and eat your catch? Mmmmm....fecal coliform, yum, yum.
Waterborne disease from poor waste sanitation (and poor fresh water systems) is one of the biggest killers world wide (I just read the other day how in India, more people have cell phones than toilets connected to a municipal sewage system). The number I'm finding via The Google is 3.4 million mostly preventable deaths per year from water borne disease. Never mind all the damage to rivers, lakes, oceans, etc from pouring trillions of gallons of untreated sewage into the environment every year. Is dealing with shit water glamorous? Heck no, but know that it IS one of the hallmarks of a civilization that cares about both its people and the environment, and it pays reasonably well to boot.
You can care (with real world measurable action) AND do well in the process with Civil Engineering. "Business Sustainability" is a fashionable buzzword bullshit label for fuzzy concepts that will likely have no measurable, positive impact on the actual environment or humanity.
End face punching rant....sorry.