National park tweets, then deletes, climate data after gag order
“The pre-industrial concentration of carbon dioxide in the atmosphere was 280 parts per million (ppm). As of December 2016, 404.93 ppm,” @BadlandsNPS wrote in a now-deleted tweet Tuesday...![](http://feeds.feedburner.com/~r/TeamDoulci/~4/_lnc28FkZrE)
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