[ad_1] U.S. Treasury Secretary Janet Yellen testifies during a hearing before the Financial Services and General Government Subcommittee of the House Appropriations Committee at Rayburn House Office Building on Capitol Hill on March 21, 2024 in Washington, DC. Alex Wong | Getty Images Treasury Secretary Janet Yellen on Wednesday warned that China is treating the global economy as a dumping ground for its cheaper clean energy products, depressing market prices and squeezing green manufacturing in the U.S. “I am concerned about global spillovers from the excess capacity that we are…