A new poll of Americans finds that after a one-time rise, the level of concern about environmental threats is continuing a fifteen-year decline.

The new Gallup poll taken on March 5-8, finds that while Americans still worry about the pollution of drinking water and air quality, the level of these concerns have dropped since the poll was first taken.

Gallup found that the ranking of the various environmental issues it has polled about have remained fairly stable with drinking water, pollution of lakes and rivers, and air quality topping the list while global warming ranks at the bottom.

But despite taking a jump in 2014, concerns over these issues have been falling since the year 2000. With this new survey, that decline has resumed. In fact, this year’s results find worries at near record lows.

Among Republicans, concern for all six polling points has fallen, in most cases by double digits. But even among Democrats worries have subsided for every question but global warming, the latter of which is up four points.

Follow Warner Todd Huston on Twitter: @warnerthuston. Email the author at igcolonel@hotmail.com.