True, but if it overflows one year and then underflows the next, then the net shift is negligible. On the other hand, humans are adding a consistent, and growing, extra contribution on top of the natural fluctuations -- and, at the same time, they are removing quite a few of the natural "sinks".
So it *does* work, and it is quite easy to explain, and NJ's dismissal of the analogy is not unreasonable but incorrect. The simple fact remains, then, that the human's "4%" is very significant indeed.
April 1st has passed or Last evening I might have wondered, when I saw on the news the suggestion that you could help save the planet by borrowing your neighbor's electric drill instead of buying one yourself!
I still believe that climate change is natural. And there's nothing anyone can do about it. Climate change is driven by geology, volcanoes, solar activity. It has done for billions of years, and will do so till the sun swallows up the Earth. This planet is still emerging from the last ice age and is naturally warming up. All these climate change and green initiatives are making money for someone. That's the truth of it.
There was an interesting letter in The Sunday Times this week from an expert in geology who said that of more than 800 experts advising the IPCC, not one of them was a geologist. It's your money they're after. Climate Change/Global warming aint man-made. Or, so as not to offend anyone, it aint human-made.