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I know I do, and part of the problem is that everyone deals with temperature every day, so it is an uphill battle trying to get across just how dramatic a 1 degree change is. It's one degree (Celsius or 1.8°F) but my house's temperature differs by more than that from room to room, and I don't normally notice that difference. Nor does a 1 degree difference in the weather materially change how hot/cold I feel. I feel freezing cold at -1, 0, or 1°C, even though pure water won't technically freeze until it hits 0°. Another difficulty because it's an average over time, is there's nothing I can look at to see where we are right now - the average temperature of the world right this second isn't particularly meaningful compared against the 1 degree line that we're measuring against. When the question of why 1 degree is so significant comes up, we can sidebar to explain just how catastrophic one degree is, but the layperson isn't always up for rigorous scientific discourse. Hell, we renamed "global warming" to be "global climate change" because of the 'joke' that global warming can't be real because it's still cold in winter (and it's still not gone away). I am unconvinced that having to explain why 1 degree is catastrophic is doing us any favors, especially considering that the average temperature rise is usually presented with one or two significant figures. What then? Short of changing human nature, which we've been trying to do for years, one possibility is to pick a different measurement, or to give additional numbers for effect. In this case, the reason the one degree change is due to how much has to be heated for that single degree change. The entire atmosphere, the water, and surface all have to warm by one degree. How much is that, actually? Is there a standard "Earth" surface area to get the right order of magnitude for just how much extra energy 1 degree is? How much energy would it take to heat this entire Earth 1 degree? We're talking on the order of zettajoules, at least. In imperial units we're talking gigatons of TNT, or petaBTUs. |