Newsweek: With the global economy in a deep recession, there’s a predictable debate going on: can we still afford to fight climate change and invest in a greener economy? Nowhere is this debate more active than in California, which has a long history of enacting strict environmental regulations. While some see California’s path toward a greener economy as extreme or overzealous, I’d describe it more simply: smart. Californians are already among the cleanest users of energy on the …