It’s not often that there’s sunny news on the environmental front, especially from grizzled activists like the great Bill McKibben. But in his new book, Here Comes the Sun, McKibben argues that the sun - or, at least, solar power - might actually save the earth. There’s a pagan quality to McKibben’s manichaean message: the sun, he says, offers both last chance for the climate and a fresh chance for civilization. McKibben's optimism, he guarantees, is anything but naive cheerleading—it's grounded in the hard numbers of energy economics. Solar power has quietly become the cheapest energy source on earth, triggering what he calls a "warp speed" buildout, particularly in China. While the climate crisis continues melting ice caps and breaking temperature records, McKibben sees this energy transition as our one scalable tool that can move fast enough to matter. Move fast and fix the world. The timeline is unforgiving: climate scientists say we need to cut emissions in half by 2030. The question isn't so much whether solar will dominate—it's whether we humans can deploy it quickly enough to prevent catastrophe and provide us with a new beginning on earth. McKibben urges both individual action—solar installations before tax credits expire on New Year's Eve—and collective organizing through events like Sun Day, the upcoming September 21st day of action.

1. Solar Power Has Hit an Economic Tipping Point Solar is now the cheapest energy source on Earth - what McKibben calls "the Costco of energy." This isn't "alternative" energy anymore; it's become the obvious, economical choice that's driving rapid global adoption.

2. China Is Dominating the Solar Revolution China installs solar at "warp speed" - the equivalent of a nuclear power plant every 8 hours in May 2025. They're using American-invented technology (solar cells, lithium batteries) to become the world's first "electrostate" and reshape global power dynamics.

3. We Have a Narrow Window to Act Climate scientists say we need to cut emissions in half by 2030. Every tenth of a degree matters - it moves 100 million people out of comfortable climate zones. Solar is our only scalable tool that can deploy fast enough to make a difference.

4. Fossil Fuel Companies Can't Adapt Traditional energy companies won't invest in renewables because, as Exxon's CEO admitted, they don't offer "above average returns." Once solar panels are installed, the sun delivers energy for free - destroying the fossil fuel business model of controlling supply.

5. Individual and Collective Action Both Matter McKibben urges people to install solar before tax credits expire on New Year's Eve, while also organizing collectively. His "Sun Day" on September 21st aims to shift public perception from seeing solar as "alternative" to recognizing it as the mainstream energy solution.

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