In the Trumpian world, as climate-change debates grow more heated—much like the planet—and the divide between energy lawyers and environmental advocates becomes deeper, a few idealistic Big Law lawyers may be tempted to switch sides. Perhaps because they love the outdoors. Or because they see a connection between rising atmospheric concentrations of greenhouse gases and rising global temperatures.

But when it comes to jettisoning an energy practice at a corporate law firm and trying to join an organization that advocates for environmental causes, the chances of success are narrow.