greenhouse gases largely that we put into the atmosphere, most of that CO2 from the use of fossil fuels. We exert a cooling influence by the aerosols, the particles that we put into the lower atmosphere by burning dirty coal, for example, putting sulfur up into the atmosphere. And those two play against one another. And the net human influence is the difference between the two about comparable to the CO2 influence net. The other thing to understand is that those human influences are physically small. They are about 1% of the natural energy flows in the system. So we've got this big system and we are tickling it a little bit. We're tickling it in a constant way. We're always adding net warming influence. But nevertheless, it's very small at the level of 1%. The third thing to understand is that there's a lot of noise in the channel, natural variability on all scales from year to year, from decade to decade, from century to century. And then finally, you have to understand that we have (22/57)
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