"Amid a growing number of heat waves, air conditioners have become a lifeline. Because these appliances are critical to keeping people cool - and protecting them from dangerously hot weather - the International Energy Agency (IEA) estimates that there may be more than 5 billion air conditioners across the planet by 2050. The problem is that while air conditioners do keep people safe, they're also a major contributor to climate change.

So why not rethink the AC entirely?"

By Rebecca Heilweil
The search for an AC that doesn't destroy the planet
The AC is about a century old. What comes next?

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"The truth is incontrovertible.
malice may attack it,
ignorance may deride it,
but in the end,
there it is." -Sir Winston Churchill