Plastics pretty much made our modern world. But they're also clogging it up.

Photo by Justin Sullivan/Getty Images.

Don't get me wrong. I really like having a water bottle that doesn't rust. But we do produce an awful lot of them. One study suggested that 5 to 14 million tons of plastic end up in the ocean every year, for instance.

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Everyone stood by as a man drowned. Here's why this refugee jumped in.

While other bystanders pulled out their camera phones, he jumped into a freezing canal.

On Christmas Day, Mohsen Alwais decided to take a road trip to Amsterdam with a group of friends.

Their plan was to walk around, see the city, and enjoy the Christmas lights and celebration.

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While world leaders were traveling to Paris to attempt to finally agree on what to do about climate change, people all over the world got together to hold their feet to the fire.

The ostensible goal of the COP21 conference in France is to produce a legally binding agreement that will help reduce emissions and slow down global warming. But climate change is already here, and the usual conference scenario — lots of important people talking a lot while getting little done — ain't gonna cut it anymore.

That's why this weekend, hundreds of thousands of people around the world gathered to send a message to their leaders:

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