Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.j.p.

That's y-A-K-U-L-T dot-C-O-J-P.

When it comes to a guide for your gut, count on YacL.

This is Scientific American 60-second science.

I'm Annie Sneed.

Solar, wind, hydropower. These renewable energy sources are all much better for the climate than fossil fuels, right?

Well, yes for wind and solar. But it turns out that the picture for hydropower is more complicated than we think.

A new study by the Environmental Defense Fund analyzed the climate impacts of 1,500 hydropower facilities across the globe.

That accounts for about half of hydropower generation worldwide.

The researchers looked at whether a facility behaves as a greenhouse gas sink or as a source. To figure this out, they investigated all the different components that

helped determine a hydropower facility's greenhouse gas emissions. There are so many factors that

contribute to greenhouse gas emissions from hydropower. But essentially, the majority of

greenhouse gas emissions arise from the reservoir itself as vegetation and soils are submerged

underwater in the dam that is used for the hydropower generation.

Alyssa Akko, a senior climate scientist at the Environmental Defense Fund and co-author of the study.

As submerged vegetation decays, it releases methane or CO2.

The larger, the surface area of the reservoir, the more greenhouse gases are going to be emitted from that reservoir.

Also, the temperature plays a role as well.

How warm the reservoir is will affect how much greenhouse gases are produced and emitted

...