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Past U.S. leaders tried to commit the nation via treaty to steep cutbacks in greenhouse gases. But without congressional support, those pledges fizzled. President Obama is trying regulation, instead.

The shipwreck, which took place overnight between Thursday and Friday, was the latest tragedy in the Mediterranean Sea along a key but dangerous route for migrants seeking a better life in Europe.

"Enough is enough," U.N. chief Ban Ki-moon says, accepting Babacar Gaye's resignation after peacekeepers were accused of raping a girl and killing two people in the Central African Republic.

Many saw his move as the final straw. Special correspondent Reza Sayah reports.

As death rates from cancer decline, why are some communities faring worse?

Also, Palestinians said at least 15 people were killed by Israeli fire.

Russia is facing an internal crisis after a fire engulfed a shopping center.

Also, families in Venezuela are demanding answers after 68 people died in a fire.

For the Scottish town of Dunblane, one deadly shooting massacre was enough.

Also, Secretary of State Mike Pompeo arrived in North Korea today for negotiations.