On May 10, 2017, actor and activist Leonardo DiCaprio took to Twitter to save a marine species.

"The vaquita is the most endangered marine mammal in the world," he wrote of the species, which can only be found off Mexico's shores in the Gulf of California. "Join me [and the World Wildlife Fund] and take action."

It may seem like an average tweet, coming from one of the biggest environmental advocates in the world. But the tweet has had global ramifications.

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Heroes

The Mexican Supreme Court's marijuana ruling could save lives on both sides of the border.

Mexico's War on Drugs was a violent failure. Legalizing marijuana may right that wrong.

In 2006, then-Mexican President Felipe Calderón went all in on his country's version of the War on Drugs.

Calderón empowered the military to take action against Mexican drug cartels and put an end to the flow of drugs to the United States. What he got was unprecedented violence, with 100,000 dead and more than 26,000 people missing.

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