Years of progress on domestic energy and environmental issues are being eradicated by near record-high levels of immigration to the U.S., according to a report from a national immigration advocacy group Tuesday.

The Federation for American Immigration Reform’s “U.S. Immigration and the Environment” study, provided to the Washington Examiner, found the steady growth of the U.S. population, 100 million over the past century, has undermined efforts to minimize the nation’s impact on the environment. The current 14 percent share of foreign-born in the country is within striking distance of the early 20th century’s 15 percent, the highest rate ever seen.