US President Joe Biden plans to triple the US tariffs on certain steel and aluminium imports from China. He has asked his trade representative to take the appropriate steps to achieve this, the White House announced in Washington on Wednesday. US workers are exposed to unfair competition due to the import of Chinese products, the statement said. The products are also among the most emission-intensive in the world. The current average tariff rate is 7.5%, a rate that dates back to the presidency of Biden’s predecessor, Republican Donald Trump. Also on Wednesday, the office of US Trade Represent…