Back in the 1980's when I was in grade school I did an independent study report for my science class on Biosphere 2. I'm not sure how I even found out about it without Google and Wikipedia. I'm pretty sure my science teacher was a combination of useless and indifferent. But I thought it was super cool.
It was heart-warming and nostalgic to find this lecture by Jane Poynter, one of the biospherians who spent 2 years inside the closed system.
I particularly like the part near the end where she shows what happens when you stop raking your leaves: you allow natural topsoil-producing processes to work. I've always fought for this as an aesthetic and maintenance-saving method. Let the leaves fall and decompose naturally. You'll never need fertilizer, you won't have to mow, and there won't be any weeds. When will people learn to trust the natural processes that give us life? I think it starts where we feel connected to the biosphere.