Pieces of a manmade inflatable raft and a still-usable lifejacket, from glued-together rubber raincoats, were found on nearby Angel Island.
Perched atop craggy cliffs over the deep blue waters of Rincon Bay, I arrived at what looked like a manmade stone wall surrounding a cluster of huts.
After warming up in a Finnish sauna -- a national tradition -- guests don socks for a 50m, often naked run through the snow to a manmade hole in the ice, where they can safely use a step ladder to dip in the icy lake waters below.
Then during our escape, she and I plunge off a broken skyhook into a manmade beach.
Even the famously stunning Blue Lagoon, just outside of Reykjavik, is a manmade pool originally built to hold wastewater from the adjacent geothermal electricity plant.
But this is an emerging and highly complex area of science because of the interplay of natural factors and manmade greenhouse gases at a time when a key set of temperatures - in the deep ocean - is still relatively unknown.
In an October poll by the Pew Research Center, younger respondents showed the highest agreement with the view that warming is manmade and that it is a "very serious" problem.
We can't be sure yet which, if any, were made worse by manmade climate change, although a study from researchers in Germany suggests that heatwaves are five times more likely due to current levels of heating.
The basic similarity between late Rome and present-day America is that in each case manmade political and social developments seriously damaged a formerly robust commercial world, leading to enormous disparities in wealth and opportunity.
Still, urban exploration remains a popular pastime, as it can be done in any manmade environment anywhere in the world.
The plans are a twist on a more ambitious previous proposal to significantly overhaul the ship and convert it into a luxury hotel docked alongside one of the sheikdom's manmade palm-shaped islands.
MSN: Queen Elizabeth 2 now planned as floating hotel in Dubai
But sea level rise, largely the result of manmade climate change, may have effects that go far beyond catastrophic flooding: a new paper shows how higher water may lead to increased volcanic activity.
FORBES: The Link Between Global Warming, Sea Levels And Volcanoes
Gallium-nitride is manmade and not found in nature, and historically, LEDs are made by growing a gallium-nitride layer on top of a base material, which is typically sapphire or, more recently, silicon carbide.
Then, so the story goes, the manmade global warming of the industrial era outstripped all natural variations and released the body as a warning to us all.
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