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 absorb and radiate infrared energy back to earth
The clouds are better conductors of heat than is the clear night air

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

There is less oxygen in the air at high altitude
Saturation vapor pressure decreases with increasing altitude
Water boils at a higher temperature with higher altitude
The temperature of the boiling water decreases with increasing altitude

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