This graph shows why solar power will take over the world
More than 100x cheaper in 35 yearsFor those who still doubt that solar power is about to shift into high gear and play a much bigger role, look at the graph above. It shows the price per watt, starting in 1977 at over $76/watt all the way down to $0.74/watt in 2013. While it's already very competitive with dirty sources of power in large parts of the world, a few more years of this and solar will simply be too cheap to ignore, even without a price on carbon emissions.
You can see a higher-resolution version of the graph here.
It's similar to the graph below, which I've written about before, but it gives a better idea of the magnitude of the drop in price because it uses a linear scale. Notice that on the graph below, each line on the scale represents a halving of costs (from 16 to 8, 8 to 4, etc). So it's the same data, but it's not as intuitive.