Environmental Science
The worst nuclear accident happened to date is occurred at

Fukushima in 2011
Three Mile Power Plant in 1979
Sellafield in 1957
Chernobyl in 1986

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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds start convection currents between them
The formation of the clouds releases latent heat energy
The water droplets in the clouds reflect infrared energy back to earth
The clouds are better conductors of heat than is the clear night air
The clouds absorb and radiate infrared energy back to earth

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