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Across the planet excess wind and solar power is being gathered and used to pump water uphill into lakes, so that when the wind dies and the sun goes down, the water can run back downhill through hydroelectric generators. This turns lakes into super-batteries capable of storing enough energy to power tens of thousands of homes.
Only certain types of fish, including mackeral and tuna, have dangerous levels of mercury and only if you eat them nearly every day. Though the Atlantic Mackeral caught here in Cornwall, contain a lot less Mercury than the Spanish Mackeral eaten elsewhere and are very safe and healthy to eat.