Denis Balibouse / Reuters
Adnan Abidi / Reuters
The 67-year-old former Portuguese Prime Minister will replace Ban Ki-moon, 72, of South Korea.
Soe Zeya Tun / Reuters
The UN Chief urges both sides to "exercise maximum restraint" and take "immediate steps to de-escalate the situation".
For starters, it should be someone who can get the international community to confront humankind’s one truly existential challenge: climate change.