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More than 100x cheaper in 35 years
For 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.