Last November the Chinese government passed a work plan to control greenhouse-gas emissions further.

ECONOMIST: Climate change

But there are a number of bills hanging around Congress, at various stages of maturity, to control greenhouse-gas emissions.

ECONOMIST: Climate change

Governor Arnold Schwarzenegger, defying opposition from business lobbies and some fellow Republicans, agreed with Democrats who control the California legislature to cap the state's greenhouse-gas emissions and reduce carbon-dioxide emissions by 25% by 2020.

ECONOMIST: Politics this week