What would a US-China trade war do to the world economy?

From bbc.com

A full-scale trade war with China and the US is in prospect after President Donald Trump imposed tariffs of more than 100% on Chinese goods imports. China has said it will "fight to the end" rather than capitulate to what it sees as US coercion, and will hike its own tariffs on American goods from 34% to 84% in response to the White House's latest move. What does this escalating trade conflict mean for the world economy? The trade in goods between the two economic powers added up to around $585bn (£429bn) last year. Though the US imported far more from China ($440bn) than China imported from America ($145bn). ... (full story)