Last week, with little fanfare, PNC Financial, the nation’s seventh-largest bank, disclosed a significant strategic shift. The bank said it would no longer finance coal-mining companies that pursue mountaintop removal of coal in Appalachia, an environmentally devastating practice that has long drawn opposition.

It was a big decision for PNC, which has been one of the largest financiers of companies that engage in the mountaintop mining of coal, which involves blasting off the summits of mountains to expose the coal beneath them and dumping the debris into valleys and rivers, which the environmental law organization Earthjustice described as “strip mining on steroids.”

PNC’s decision comes after environmental advocacy groups put intense pressure on Wall Street banks to stop financing such practices. PNC had been a holdout; Bank of America, Citigroup, Morgan Stanley, JPMorgan Chase, Wells Fargo, Credit Suisse and others had already distanced themselves from coal companies involved in mountaintop removal. GE Capital and UBS appear to be the only large financial institutions in the country still willing to lend money to companies involved in this mountaintop mining, and even they are scrutinizing such activities.

A spokeswoman for UBS said the firm had reduced its financing of mountaintop removal of coal substantially, pointing to a 2014 report issued by the company explaining how the firm approaches financing such activity, called MTR. “Coal-mining companies that rely on MTR as part of their production are also assessed to what extent they rely on MTR mining for their revenue generation, and UBS needs to be satisfied that the client is committed to reduce over time its exposure to this form of mining. Any potential transaction with a company involved in MTR fully depends on whether the company’s environmental and social performance complies with our environmental and social risk framework and associated processes.”