Name: 【TEDx】Lighting -- an evolving and efficient pathway to cleaner air: Robert Davis at TEDxPSU
Uploaded: 2014-05-05T18:50:04.000Z
Duration: 11 min 12 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

I have just turned on the standard electric light bulb,

which has been unchanged, except for the filament

Sam Taylor, what do you think the efficiency

>> Melissa Marshall, what do you think the efficiency is

Well, actually, believe it or not, this light bulb,

which we've used for so long and which is

we're spending about 55 billion dollars a year

on electricity for which we use 20 percent

of all the electricity generated in the United States,

and most other developed countries, just for lighting.

So if you're going to have something this inefficient,

And 20 percent of our energy is being used for this.

And in the United States, and most other places, in fact,

most of our electricity is still generated

The emission from these coal-powered plants,

in terms of CO2, is on the order of 110 million tons of CO2.

An equivalent weight to our family automobile,

the equivalent weight is 73 million automobiles.

So if you line those automobiles up end to end,

they would encircle the diameter of the earth 9 times.

You see on this map now, the bright areas,

the bright areas are where people are connected

of our electrical-generating capacity for just lighting.

of the globe has no access to electricity.

they still have to provide lighting in some way.

Candles, very familiar with that, diesel fuel, kerosene,

whale oil, seal oil, particularly in the northern latitudes,

cheese, and my favorite, yak butter [laughter].

all of those sources spread throughout the world provide 1

which is equivalent to 93 million vehicles today,

if you tied them end-to-end, would go to the moon

The takeaway from this, takeaway number from this,

into the atmosphere throughout the world,

30 percent of the CO2 put in the atmosphere

around the world is only, is generated only for lighting.

Interestingly enough, the legislatures of many

of the developed countries have already pushed us into this

by legis, by saying, passing laws bipartisanly, actually,

that say after, in the United States, after January 1, 2014,

we will, the, the 40-watt bulb, the 75-watt bulb,

60-watt bulb, and 100-watt bulb will no longer be for sale.

You cannot, after inventories are depleted,

you will not be able to go to your source of light

I was in my Lowe's in Pittsburgh two weeks ago,

not a single incandescent light bulb was for sale.

Alright, so, I think we can cut this one out.

the compact fluorescent introduced in 1995,

and the light-emitted diode, which is here enveloped

in a standard glass shell, and, and also with an Edison end

on it, so you can screw it into your lamp.

I had these up here, let's take a look at some

I'm going to emphasize the LED at this point,

because I think that the fluorescent light has pretty much

The light, light-emitting diode has not reached the end

of its innovation, it's still coming, it's still being more,

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【TEDx】Lighting -- an evolving and efficient pathway to cleaner air: Robert Davis at TEDxPSU

equivalent

lead

fuel

light