> The reason is that exponential-growth phenomena, like the adoption of any new technology, are tiny for a long time until suddenly they aren't. My favorite ex

> The reason is that exponential-growth phenomena, like the adoption of any new technology, are tiny for a long time until suddenly they aren't. My favorite exponential-thinking thought experiment is imagine a lake that just got an invasive plant injected into it. The plant has no predators and reproduces daily, so lets say it doubles every day. If we say the lake gets completely overrun in 30 days, what day is the lake half full? There's a fancy formula for this, but you don't need it -- it doubles every day so it takes all the way until the 29th to be half full. That's the key about renewables... they're not an extractive technology (where the more we extract only the more expensive stuff sticks around), they're a manufacturing technology (where the more we make, the better we get at making it and so it only becomes cheaper).