Possibly you're smoking too many, Lewis?

Can Weeds Help Solve the Climate Crisis? - Global Warming - Environment - NYTimes.com

Lewis Ziska, a lanky, sandy-haired weed ecologist with the Agriculture Research Service of the U.S. Department of Agriculture, matches a dry sense of humor with tired eyes. The humor is essential to Ziska’s exploration of what global climate change could do to mankind’s relationship with weeds; there are many days, he confesses, when his goal becomes nothing more than not ending up in a fetal position beneath his battleship gray, government-issue desk. Yet he speaks of weeds with admiration as well as apprehension, and even with hope.