Tallying Nitrogen's Increasing Impact Human activities have doubled the natural background rate of nitrogen fixation on land.
Pollution helps weeds take over prairies.
When nitrate reigns. Where acid reigns. Car phones jack up risk of collisions Both driving while phoning and driving while intoxicated at least quadruple a driver's risk of having a collision. Cautions about car telephones and collisions. Redelmeier, D.A., and Tibshirani, R.J. 1996.