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No, the main difference from the past is that we have been taking fossil fuels out of the earth and burning it for the last 200 years, and releasing in that very short time the CO₂ that has been stored in them for many millions of years. This is much more than the amount of CO₂ that the environment's carbon sinks can bind and so we are warming the environment, and at a very fast pace. Like you say, the CO₂ we breathe "comes from the air". Specifically, that CO₂, like the carbon gasses released by farming and agriculture, is part of the atmospheric carbon cycle that circulates carbon gasses between the biosphere and the atmosphere. This cycle is stable, it has been stable for millions of years and it has never caused a greenhouse effect, neither is there any risk that it will cause a greenhouse effect, now or in the future. There is certainly no chance that the CO₂ we exhale will cause the amount of CO₂ in the atmosphere to shift, because that's where we get our carbon in the first place. The internal combustion engine on the other hand, efficient or not, is burning fossil fuels and is a primary driver of release of the CO₂ bound in fossil fuels, to the environment. This is a major mechanism of climate change. That having been cleared up, you're making a weird argument that is very difficult to support. If I understand correctly your earlier comment that I quoted, you're saying that living, in summary, without burning fossil fuels, is not less sustainable than living while burning fossil fuels. You 're saying that this is because the internal combustion engine is efficient. You mean that it makes good use of the fuel it burns, but its fuel cannot be easily replaced (because it takes billions of years for it to be created by natural processes that we can't replicate at scale) and burning it is causing a greenhouse effect and climate change. So, no, it doesn't make any sense that living without burning fossil fuels, without combustion engines, without all the trappings of modern life, is not more sustainable than living with them. We can discuss the benefits and risks of either way of life (I'm not keen to return at a pre-industrial time myself) but it is abundantly clear which way of life is sustainable, and which isn't. And that's not "more sustainable". Burning fossil fuels is just not sustainable anyway you cut it. |