Quote:
Originally Posted by OMG!WTF!
An honest question I've had for a while is how do you respond to someone who thinks it's a hoax, or thinks the stuff like, it's all volcanoes or it's all the sun activity or co2 is plant food is valid? Or is it all valid in some way?
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That's why the answer is "humans are mostly responsible but natural variation plays a role too." By discounting natural variation, your position is basically "the climate has never changed" which is demonstrably false. But if you allow that yes, natural forces also have an impact on our climate, your explanation to them becomes that our current rate of change is beyond the scope of natural variation, particularly the rate of CO2 accumulation which is easily demonstrable. And yes, CO2 is plant food, but it is also a greenhouse gas. It can be both.
As for the hoax part, I don't even know how you get there. Is the CIA running up to glaciers at night running hair dryers to melt them?