US president Donald Trump's massive, sweeping tariffs sent global stock markets tumbling on Thursday, setting the stage for a worldwide trade war and ratcheting up the dangers of a punishing recession. Experts fear that the US cleantech sector is especially vulnerable to a deep downturn, which would undermine the nation's progress on reducing greenhouse-gas emissions...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. Trump's tariffs will deliver a big blow to climate tech US president Donald Trump's massive, sweeping tariffs sent global stock markets tumbling yesterday, setting the stage for a worldwide trade war and ratcheting...