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How can a tiny trace gas change the climate?

"How can a minuscule amount of CO2 cause global warming?" shout the sceptics! "Easily", is the response. Can't a bite from a tiny insect produce death from a serious disease; and an injection with a tiny amount of serum reverse it?
We're seeing today what John Tyndall predicted in 1859.

The basic science of climate change is more than 150 years old. Back in 1859, Irish physicist John Tyndall predicted that winters would warm faster than summers, and nights faster than days. Now we see it borne out.
Slowing emissions is like slowing credit card spending...

Slowing emissions of carbon dioxide is somewhat like slowing credit-card spending and expecting your debt to shrink.
The 'Copernicus' of Global Warming

Joseph Fourier (1768 — 1830), the 'Copernicus' of global warming.
CO2 is only a trace gas.   And arsenic is "only a trace" element.

Saying that CO2 is "only a trace gas" is like saying that arsenic is "only" a trace water contaminant.
Turbochargers lag engine starts, but they make the car faster.

Does the pre-historic lag between temperature and CO2 rise mean CO2 can't affect temperature? No. An auto turbocharger kicks in only after the engine starts, but you can't explain the car's speed without it. Similarly, in earth's past, CO2 rise kicked in following slight initial warmings, but you can't explain de-glaciation without it.
Like a train, change starts slowly but hard to stop

Climate change is like a train: it starts slowly, but it’s awfully hard to stop once it gains a bit of momentum.
CO2 in atmosphere is like water in bathtub (Var. 2)

The concentration of carbon dioxide in the air is like the water level in a bathtub. If water pours in faster than it drains out, the level keeps rising.

Currently we 'pour' about twice as much CO2 into the atmosphere than is "drained out" by natural processes (absorbed by oceans, plants, rocks) <...
The greenhouse effect isn’t rocket science

‘The science behind the greenhouse effect was simple enough to have been widely understood by the mid 19th century, when the light bulb and the telephone and the automobile where being invented – and not the atomic bomb or the iPhone or the space shuttle. The greenhouse effect isn’t rock science.’ – Nate Silver, author of The Signal and the Noise, page 376.