You've heard of credit default swaps and subprime mortgages. Are carbon default swaps and subprime offsets next? If the Waxman-Markey climate bill is signed into law, it will generate, almost as an afterthought, a new market for carbon derivatives. That market will be vast, complicated, and dauntingly difficult to monitor. And if Washington doesn't get the rules right, it will be vulnerable to speculation and manipulation by the very same players who brought us the financial meltdown.