It's not CO2.

The sun has an 11 year cycle, right? Maybe it has another cycle that we haven't discovered yet.

Kramer

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“It's time to admit that public education operates like a planned economy, a bureaucratic system in which everybody's role is spelled out in advance and there are few incentives for innovation and productivity. It's no surprise that our school system doesn't improve; it more resembles the communist economy than our own market economy."
Albert Shanker, former president of the American Federation of Teachers