By Kate Sheppard After months of engine-revving, the Lieberman-Warner Climate Security Act sputtered to a halt in the Senate last week. Now attention has turned to what was learned -- or wasn't -- and how things might play out the next time a climate bill makes it this far. Despite what looked from the outside like an unproductive and anticlimactic week of grandstanding and delays, the bill's sponsors emerged from the experience claiming sunny optimism about the future. "It's a giant...

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