Climate change… What is it? How do we know it’s happening? How do we know it’s our fault? What will the future climate look like? Why aren’t we doing anything about it? As individuals, what can we do about it?
How do we know it’s our fault? How
do
we
know
that
we
put
that
excess
carbon
dioxide
in
the
atmosphere?
Historical
records
of
human
ac8vity
Lighter
isotopic
composi8on
of
atmospheric
carbon
Decrease
in
atmospheric
oxygen
(combus8on)
How
do
we
know
the
excess
carbon
dioxide
has
caused
the
rise
in
global
temperature?
Our
knowledge
of
the
Greenhouse
effect
Our
knowledge
of
the
Earth’s
climate
history
Nothing
else
makes
sense
Climate
modelling
Why aren’t we doing anything about it? We can emit 565 more gigatones of CO2 to stay below 2°C warming Fossil fuel companies have 2,795 gigatons in their reserves
What is climate change? The trapping of extra energy from the sun How do we know it’s happening? We measured it How do we know it’s our fault? Some cool scientific detective work ○ Basic concepts from the 1800s, lighter carbon, decreasing oxygen, computer climate models, historical records, … Conclusions
Conclusions What will the future climate look like? Hotter, higher seas, more acidic oceans Wet get wetter, dry get drier Why aren’t we doing anything about it? Money / vested interests As individuals, what can we do about it? Don’t be an individual - get involved in the community/movement ○ e.g. divestment, rallies
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