The National Rifle Association isn’t invincible after all. The powerful gun lobby has lost lucrative business partnerships with dozens of companies since the Valentine’s Day massacre at Marjory Stoneman Douglas High School in Parkland, Florida. Under the heat of public scorn—fueled by the activism of teenage survivors—the NRA lost business deals with insurers, airlines, major car rental businesses, banks, a wine manufacturer, and a hearing aid company. Assault weapons manufacturers are also losing business, after ThinkProgress published a list of banks that finance them.

Public opinion doesn’t always matter in politics. Though support for gun control is at a record high, the issue is a non-starter in Congress. But public opinion certainly matters in business; the majority of Americans won’t buy products from companies they believe to be unethical. The customer is always right, and at the moment, many businesses believe that their most important customers don’t like the NRA.

The recent success of the gun control movement in the corporate space is instructive for progressive activists of every stripe today. But this is especially true on the issue of global warming. Like gun control, climate action has sweeping public support but not enough in Washington. Both issues are a matter of life and death. And just as banks have partnered with the gun lobby, they have also provided billions to fossil fuel companies that exacerbate climate change. They’re ripe targets for environmentalists.

Wells Fargo and JPMorgan Chase, two of the “big four” U.S. banks (along with Bank of America and CitiGroup, are prime corporate targets for the environmental movement. Wells Fargo is already under pressure after the Parkland massacre; on Wednesday, Bloomberg revealed the bank to be “the preferred financier for the U.S. gun industry,” helping gun manufacturers access $431.1 million in loans and bonds since the 2012 shooting at Sandy Hook Elementary School in Newtown, Connecticut. Wells Fargo and JPMorgan Chase are also two of the preferred financiers for the U.S. fossil fuel industry’s most controversial companies and projects.

Both banks, for instance, recently renewed their participation in a set of $1.5 billion loans to TransCanada, the company behind the yet-to-be-completed Keystone XL pipeline. The $8 billion project would transport high-emitting tar sands oil from Canada down to the Gulf Coast. Wells Fargo says the loans “are for general corporate funding” of TransCanada as a company, “and not for any project funding” of the pipeline specifically. But TransCanada is a major transporter of tar sands, a thick form of oil that is far more carbon-intensive to extract than conventional crude and far more difficult to clean up when it spills. General corporate funding for TransCanada means corporate funding for tar sands production.