| 1 |
Yes.
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1 |
Yes.
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| 2 |
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2 |
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| 3 |
The overwhelming scientific consensus says human activities contribute to climate change and global warming (on average).
|
3 |
The overwhelming scientific consensus says human activities contribute to climate change and global warming (on average).
|
| 4 |
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4 |
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| 5 |
- interesting XKCD with the 20k year relative temperature curve
|
5 |
- interesting XKCD with the 20k year relative temperature curve
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| 6 |
https://xkcd.com/1732/
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6 |
https://xkcd.com/1732/
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| 7 |
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7 |
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| 8 |
- miscellaneous info on the NASA website
|
8 |
- miscellaneous info on the NASA website
|
| 9 |
https://climate.nasa.gov/evidence/
|
9 |
https://climate.nasa.gov/evidence/
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| 10 |
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|
10 |
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| 11 |
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11 |
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| 12 |
Despite
the
short
term
warming
trend,
I
don't
think
there's
consensus
about
where
it'll
end
up
in
hundreds
of
thousands
of
years,
though.
There's
historical
precedents
where
it
got
significantly
warmer
and
still
cooled
down.
On
the
PETM
55
million
years
ago,
CO2
rose
to
about
2000
ppm
and
temperatures
got
up
to
about
+8ºC
relative
to
current
ones
for
about
200K
years,
but
then
over
about
100K
years
it
cooled
back
down:
|
12 |
Despite
the
short
term
warming
trend,
I
don't
think
there's
consensus
about
where
it'll
end
up
in
hundreds
of
thousands
of
years,
though,
or
how
it'll
get
there.
There's
historical
precedents
where
it
got
significantly
warmer
and
still
cooled
down.
On
the
PETM
55
million
years
ago,
CO2
rose
to
about
2000
ppm
and
temperatures
got
up
to
about
+8ºC
relative
to
current
ones
for
about
200K
years,
but
then
over
about
100K
years
it
cooled
back
down:
|
| 13 |
\n
|
13 |
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|
| 14 |
https://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum
|
14 |
https://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum
|
| 15 |
http://www.xylenepower.com/PETM.htm
|
15 |
http://www.xylenepower.com/PETM.htm
|
| 16 |
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|
16 |
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|
| 17 |
also note that we're apparently releasing CO2 into the atmosphere at 10x the rate of the PETM event:
|
17 |
also note that we're apparently releasing CO2 into the atmosphere at 10x the rate of the PETM event:
|
| 18 |
https://www.sciencedaily.com/releases/2011/06/110605132433.htm
|
18 |
https://www.sciencedaily.com/releases/2011/06/110605132433.htm
|
| 19 |
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19 |
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| 20 |
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20 |
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| 21 |
and that the sea level at the time was over 50m higher than today:
|
21 |
and that the sea level at the time was over 50m higher than today:
|
| 22 |
http://pages.geo.wvu.edu/~kammer/g231/PETM.pdf (page 4)
|
22 |
http://pages.geo.wvu.edu/~kammer/g231/PETM.pdf (page 4)
|
| 23 |
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23 |
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Do YOU believe in climate change and global warming?