Britain's population exploded during the Industrial Revolution. To sustain that growth, they needed a lot of food and, therefore, a lot of fertilizer. Their ports were clogged with boatloads of imported poop and bones from all over the world, until they discovered a rock that was the best fertilizer of all. Ever since, our entire global food system has precariously teetered on access to a precious fossil resource: phosphorus.This video serves as a companion to SciShow examines ammonia, a molecule that has fed billions through fertilizer, which I'm recycling as part of my response.
A fact I repeat to my environmental science students is that synthetic fertilizers are responsible for growing enough crops to feed at least one billion people and are the number one reason for increased crop production. It turns out I may have been understating their importance...fertilizers have helped feed billions. The BBC went farther, quoting Svein Tore Holsether, head of fertilizer company Yara, reporting that "He pointed out that half of the world's food production is dependent on fertiliser." That was in the context of the Russian invasion of Ukraine, about which Holsether told the BBC "Putin has weaponised energy and they're weaponising food as well." Yikes! That's a topic that deserves its own post.This isn't that post. Darn.
SciShow did make up for a deficit I noticed three years ago.
SciShow didn't even mention the effects of excess fertilizer washing into the environment and causing eutrophication. That's a word I've never used on this blog before, which means I need to write a post about that, too.Hank and SciShow at least included this effect as an result of (over)fertilizing crops. Count this as a down payment on that promise.
Hank pointed out that the current major sources of phosphorus are nonrenewable and will run out. That's something I've told my students, but it's not going to be fixed until we approach the production peak, much like petroleum. That might happen as soon as the middle of this century. I might not see that happen, but my students will, so they're the ones who will have to deal with it. In the meantime, they can watch this video and turn in a summary for extra credit. Welcome to blogging as professional development.
