Steroid Cities are those fast-growth metro areas, mainly located in America's South and West, where the sun shines, the air-conditioners hum and the two languages you'll need to master in addition to English are capitalism and Spanish.

FORBES: Steroid Cities

It was the first summer I was in business, and the dry desert heat of my hometown came on strong, bringing a steady stream of customers through the door looking for ice-cold smoothies and air-conditioned relief from the scorching sun outside.

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They're urged to drink plenty of water, reschedule strenuous activities, stay in air-conditioned rooms, stay out of the sun and check in on relatives and neighbors.

CNN: Heat expected to fry mid-Atlantic states

The National Weather Service advises residents to wear lightweight and loose-fitting clothing, drink plenty of water, take frequent breaks in shaded or air-conditioned environments, stay out of the sun and check on relatives and neighbors.

CNN: Heat wave sweeps across U.S. Northeast

There is no sign to mark it, just a sprawl of heavy, dark, tropical hardwood left to dry and age in the sun and a couple of half-finished canoes in front of the open-air shed where he does his work.

BBC: A tale of the South Pacific

But a clear, cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more easily than they do red light.

BBC: rainbow

One of these changes, which would promote global warming, is a rise in the level of so-called greenhouse gases (particularly carbon dioxide) which trap heat from the sun and thus warm the air.

ECONOMIST: More evidence that global warming is man-made