Kyoto Climate Treaty Takes Effect, Impact is Unclear

From MSNBC:

Seven years after it was negotiated, the Kyoto global warming pact went into force Wednesday — imposing limits on emissions of carbon dioxide and other gases that many scientists blame for warmer temperatures, melting glaciers and rising oceans...

The United States, the world’s largest emitter of such gases, has refused to ratify the agreement, saying it would harm the economy and is flawed by the lack of restrictions on emissions by emerging economies China and India.