Climate change alarmists won’t like the results of a study that shows the 20-somethings aren’t all that concerned about the environment.

Steepest of all was a steady decline in concern about the environment and in taking personal action to save it.

Researchers found that, when surveyed decades ago, about a third of young baby boomers said it was important to become personally involved in programs to clean up the environment. In comparison, only about a quarter of young Generation X members — and 21 percent of Millennials — said the same.