Penrhyn Mawr

Swell, Wind Waves, Tides and the Effects of Landforms

Presentation by Tom Bergh for


Sea kayaking places us directly within two primary and unusual marine energy systems. Tides and their resulting currents, and ocean swell with their long periods.

Swells are moving hills of heavy, dense energy with often dramatic effects on the surface topography of the sea. Swells can intensify forces in the coastal zone, and often push Paddlers into heightened Fun or Fear dimensions.

Wind, above all environmental variables, has the greatest daily impact on most sea paddlers. So predicting wind speed, its direction, and understanding its impact on the texture of the sea, is essential to your seamanship skills. Winds are the movement of air caused by differences in temperature and pressure.

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Deception Pass

How Ocean Currents Work

(and How We Are Breaking Them)

A fun, silly and scientifically accurate 12 minute summary of how Ocean Currents work, and their effects on the North Atlantic.

Featured photo of Deception Pass, Puget Sound, WA.

Prarie Creek Redwoods State Park, Hoopla, California

The Man Who Planted Trees

A Story of Lost Groves, the Science of Trees, and a Plan to Save the Planet

By Jim Robbins

The cast of characters reads like a science fantasy novel: Methuselah, Twin Stem, Old Blue, Gramma, Stagg and Waterfall. But these names aren’t the names of hobbits and elves; they’re behemoth trees — Champion Trees.

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Trawler passes Portland Head Light

Supertrawlers and Trump: Scraping the Bottom

On June 5, 2020 President Trump unveiled the decision to ease protections for Northeast Canyons and Seamounts Marine National Monument off the coast of New England, opening it to commercial fishing. Trump made the announcement in Bangor, Maine at a roundtable discussion with commercial fisheries companies and Maine’s former Republican governor, Paul LePage. Maine's Governor Janet Mills was not invited to the event.

Northeast Canyons and Seamounts Marine National Monument

Northeast Canyons and Seamounts Marine National Monument comprises nearly 5,000 square miles of protected area that contains endangered right whales and sensitive deep sea corals. It has been closed to most commercial fishing since 2016. Trump called the existing regulations "ridiculous" and "terrible," reported WBUR Earthwhile.

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