May I have your attention please you can now book your train tickets on Uber and get

10% back in credits to spend on your next Uber ride so you don't have to walk home in the rain again.

Trains now on Uber. T's and C's apply. Check the Uber app. I love a short cold water swim in Puget Sound in Washington State.

I start from a rocky shore near my home.

If I kept swimming just another 100 feet out, I could dive a few feet down through these clear waters into an underwater forest where animals such as shrimp crabs and small fish, like linkod, rockfish, and maybe even salmon like to live.

This is Scientific Americans science quickly. I'm Star of Artan.

Cal forests are made of thick undulating ribbons of brown algae that hang onto rocks at the sea floor and grow toward the light

above.

Calp is found in dense groups like trees on land, hence the name forests.

But just like forests on land, lately these underwater forests have come under threat from climate change.

The Calp forests off California's coasts have largely disappeared in recent years.

It all started in 2013 with a mysterious blob.

That's what scientists called this blobbish patch of warmer than normal ocean water,

which was created by changes in the atmosphere above the Pacific.

The Blah brought drastic changes to the California kelp forests.

Elevated ocean temperatures led to a die-off of sea stars. Sea stars typically control the

population of sea urchins, sea urchins, eat kelp. And so the coming of

the blob created an explosion of urchins. The creatures went on an eating spree that, by some

estimates, cleared 96% of the kelp from beneath the California coast. Up north, Canadian

Pacific kelp forests have also been stressed and shrinking.

For now, the forests and Puget Sound, where I live, are intact in some regions but not in others.

That means there's both time to research kep's importance and to try and save it.

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