Damming doesn't hurt salmon? Something is fishy, scientists say.

Darkfrog submitted, created time 2 months 1 week (www.nature.com)

Damming rivers is an environmental conundrum. On the one hand, hydroelectric power provides clean, relatively reliable energy. On the other, damming rivers can endanger fish populations ...or can it? A recent study performed on the dammed Columbia River and undammed Fraser River suggests that perhaps the smolts are all right.

Salmon travel the rivers at two points in their lives: first, they must find their way downriver to the ocean as smolts (juveniles) and second, they must find their way back upstream to the spawning grounds in the last stage of their lives

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Carbon-free energy? Already in progress, says Nature.

Darkfrog submitted, created time 4 months 3 weeks (www.nature.com)

Here, Nature magazine gives an overview of the several different means of generating electricity without releasing carbon dioxide into the atmosphere. Increasing the efficiency of existing fossil fuel systems is also given its due.

Once again, we see why Nature is at the very top of science writing. Take a look at this:

"The fact that hydroelectric systems require no fuel means that they also require no fuel-extracting infrastructure and no fuel transport

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It Came from the Sea--Renewable Energy, That Is

Going Down: Climate change, water use threaten Lake Mead