>"(Reuters) -U.S. Treasury Secretary Janet Yellen on Wednesday pledged to aggressively tackle climate change using all the tools at her disposal, warning that a failure to do so effectively and promptly could undermine economic growth. To bring the U.S. economy in line with international goals of eliminating carbon emissions will "require bold and urgent action - nothing less than transforming important sectors of the global economy, especially when it comes to how we generate power and move people and goods," Yellen said in a wide-ranging speech to the Institute of International Finance. "We are committed to directing public investment to areas that can facilitate our transition to net-zero and strengthen the functioning of our financial system so that workers, investors, and businesses can seize the opportunity that tackling climate change presents," Yellen said."