U.S. swimmers leave Rio after police questioning

Recent droughts in Colombia and Ecuador have severely hampered energy supplied by hydropower. Can the cheap, low-carbon renewable still thrive in an increasingly hot and dry world?

Dust storms that carry particles from the Sahara into European capitals are more common than you'd think. Here's what you should know about them and how to keep yourself safe.

Find these stories and much more when you grab a copy of The Guardian on Saturday.