On March 1 the Club of Rome and the Smithsonian co-hosted an historic, day-long symposium, Perspectives on Limits to Growth, offering reflections on The Limits to Growth, the landmark study released in 1972. Two of the scientists involved in that study (who went on to author the book, as well as updates ten, twenty and thirty years later), Dennis Meadows and Jørgen Randers, were among those who spoke. This is a lot of video, and it begins with the obligatory welcomes, etc. from the dignitaries. But there are some great presentations here, especially those from Meadows and Randers, that are well worth watching.

This is day six of our exponential growth demonstration. I hope you’re doing this at home with your children or spouse, or at work with your colleagues. It’s going to get interesting. If you want to catch up, head over to our Limits to Growth 40th anniversary page, where you can easily access the blog posts explaining the demonstration. Yesterday we had 16 grains of wheat in our container. Today let’s double that, for 32. . . .

I skipped a day in this Limits to Growth blog series and the exponential growth demonstration. My Australia tour had me exhausted and something had to give. But today I’m back, with day five on the demonstration. Yesterday we were at 8 grains of wheat. Today, double that for 16.

Be sure to take the Think Small pledge. Make a difference, and encourage your friends to take the pledge. Thank you.

I’m very pleased to share this guest post by Samuel Alexander, co-founder of The Simplicity Collective. This is a brief introduction to a full paper available at The Simplicity Collective website. Samuel was one of the musical contributors to the GrowthBusters Earth Day Fundraiser Soundtrack album released last year (still available in our store). You can hear more of Sam’s very relevant music here. I’d like to thank Sam for this paper and contribution to our series, and for his contribution of music. As we contemplate limits to growth, it is very sensible to wonder how we might elegantly live within those limits. Dr. Alexander offers some food for thought. . . .

For a week we’ve explored the 1972 Limits to Growth study and the power of exponential growth (yet to be apparent in our wheat doubling demonstration). If you’re just now joining the conversation, explore the series here. We’ll have more, but right now you may be wondering what you can do with this information. It can be a bit daunting. Breaking the chains of growth addiction – whether it’s your own addiction, your town’s, or our society’s, seems difficult, if not impossible. Yes, in my view that’s about right. On a degree of difficulty scale of 1 to 10, this is a 15. But we actually can pull it off. We just have to break it down into a short laundry list of attitudes and behaviors, and then get busy checking them off. . . .

This is day three of our exponential growth experiment/demonstration. It’s not too late to jump into this little adventure – and bring your kids, your class or your co-workers along for the fun. You can catch up quite quickly. We began with an empty beaker (you can substitute a jar, pitcher, test tube, etc.) and a large bag of wheat, barley, rice, cheerios, marbles, or…you get the picture.

On day one we simply placed one grain of wheat in our beaker. On each successive day we double the number that were in the beaker the day before. So… on day one we had one, on day two we were at two, and today we double that for four grains in the beaker: . . .

This is day two of our lab experiment demonstrating the power of exponential growth. Yesterday we placed one grain of wheat in our beaker. Here’s what that looked like:

Today we will double the number of grains in our beaker. Tomorrow we’ll double that. This represents just under 3% growth per hour. It’s not too late for you to join us in this demonstration. Get your family involved, or co-workers, or fellow students. Share your photos, videos or experiment stories with us in the comments below.

For forty years, the scientists who developed the computer models behind the Club of Rome‘s Limits to Growth study have watched as their recommendations were ignored. Visiting with Dennis Meadows a couple of year ago I believe I could sense the toll that had taken. In my own case, I’ve been busting growth addiction for only 25% of that time, and I feel pretty weary at times. . . .