The Download: what Trump's tariffs mean for climate tech, and hacking AI agents

US president Donald Trump's massive, sweeping tariffs sent global stock markets tumbling yesterday, 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 progress on reducing greenhouse-gas emissions. Agents are the talk of the AI industry--they're capable of planning, reasoning, and executing complex tasks like scheduling meetings, ordering groceries, or even taking over your computer to change settings on your behalf. But the same sophisticated abilities that make agents helpful assistants could also make them powerful tools for conducting cyberattacks. They could readily be used to identify vulnerable targets, hijack their systems, and steal valuable data from unsuspecting victims.