1
00:00:17,333 --> 00:00:21,637
So this gives me to my brief,
why this matters for take.

2
00:00:21,637 --> 00:00:26,275
Why would I care which
one of these CO2 takes?

3
00:00:26,275 --> 00:00:26,875
All right?

4
00:00:26,875 --> 00:00:27,376
OK.

5
00:00:27,376 --> 00:00:33,549
Well, it turns out that as long
as we're not at absolute zero,

6
00:00:33,549 --> 00:00:36,785
this molecule is moving.

7
00:00:36,785 --> 00:00:42,391
And so, obviously,
that's related to this.

8
00:00:42,391 --> 00:00:43,292
It's not obvious.

9
00:00:43,292 --> 00:00:50,199
But cars in the US are now
the number one emitter of CO2.

10
00:00:50,199 --> 00:00:50,699
OK?

11
00:00:50,699 --> 00:00:54,837
They're the number one
cause of CO2 emissions.

12
00:00:54,837 --> 00:00:58,607
And here's a nice
little corner somewhere.

13
00:00:58,607 --> 00:01:02,544
And so, this is coming out now
from the transportation sector.

14
00:01:05,681 --> 00:01:08,851
More of the CO2 comes from
that than any other sector.

15
00:01:08,851 --> 00:01:09,718
Why does it matter?

16
00:01:09,718 --> 00:01:13,555
Well, why does this
Lewis structure matter?

17
00:01:13,555 --> 00:01:15,457
Well, it has to do
with how it moves.

18
00:01:15,457 --> 00:01:20,496
Because, you see, I
showed you this before.

19
00:01:20,496 --> 00:01:23,932
And I didn't complete it because
we were talking about electron

20
00:01:23,932 --> 00:01:26,801
transitions, and then
I gave you the example

21
00:01:26,801 --> 00:01:30,539
of ozone being really important
for absorbing in the UV.

22
00:01:30,539 --> 00:01:33,642
And I showed you the chemistry
of ozone degradation with CFCs.

23
00:01:33,642 --> 00:01:36,110
You see, look at this
absorption out here.

24
00:01:36,110 --> 00:01:38,113
There's CO2, right?

25
00:01:38,113 --> 00:01:40,182
And so, there's the sunlight
above the atmosphere.

26
00:01:40,182 --> 00:01:41,517
Here it is on Earth.

27
00:01:41,517 --> 00:01:43,719
And you could see CO2 there.

28
00:01:43,719 --> 00:01:47,456
But see, the reason
CO2 absorbs there

29
00:01:47,456 --> 00:01:49,625
has to do with how it moves.

30
00:01:49,625 --> 00:01:52,828
It has to do with
its vibrations.

31
00:01:52,828 --> 00:01:54,263
Now, that's not
something that you

32
00:01:54,263 --> 00:01:57,598
need to know for like
a test or something,

33
00:01:57,598 --> 00:02:00,035
but I wanted to tell you about
it because it is directly

34
00:02:00,035 --> 00:02:02,171
related to what we just did.

35
00:02:02,171 --> 00:02:03,939
Those vibrations--
and by the way,

36
00:02:03,939 --> 00:02:08,710
that first mode is the one
out here doing all the IR

37
00:02:08,710 --> 00:02:09,845
absorption.

38
00:02:09,845 --> 00:02:10,345
Right?

39
00:02:10,345 --> 00:02:11,413
This one.

40
00:02:11,413 --> 00:02:15,484
And you can see right away,
if this thing is wiggling,

41
00:02:15,484 --> 00:02:17,553
it's going to wiggle
very differently.

42
00:02:17,553 --> 00:02:18,053
Right?

43
00:02:18,053 --> 00:02:20,422
It's going to wiggle very
differently whether it

44
00:02:20,422 --> 00:02:23,425
has two double bonds on
either side of the carbon,

45
00:02:23,425 --> 00:02:24,793
or a triple and a single.

46
00:02:24,793 --> 00:02:25,294
Right?

47
00:02:25,294 --> 00:02:26,929
And so that, alone,
tells you something

48
00:02:26,929 --> 00:02:29,064
really important
about how it interacts

49
00:02:29,064 --> 00:02:33,302
in our atmosphere with
radiant heat, right?

50
00:02:33,302 --> 00:02:35,938
With IR radiation.

51
00:02:35,938 --> 00:02:36,839
OK.

52
00:02:36,839 --> 00:02:38,540
That's my 'why this matters.'