In the U.S. this week, Democratic presidential hopefuls squared off in the second round of debates, a new California law requires President Trump to release his tax returns, and the ACLU said more than 900 children were separated from their immigrant parents in the year after a court restricted the practice.

Around the world, the U.S. sanctioned Iran's foreign minister, the Afghan peace process faced more challenges, and Ethiopians planted 350 million — yes, million — trees in a single day.

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