Two hundred years ago, on this day, October 21st, 1824, Joseph Aspdin got a patent…
By 1817, he had set up in business on his own in central Leeds. He must have experimented with cement manufacture during the next few years, because on 21 October 1824 he was granted the British Patent BP 5022 entitled An Improvement in the Mode of Producing an Artificial Stone, in which he coined the term “Portland cement” by analogy with the Portland stone,[3] an oolitic limestone that is quarried on the channel coast of England, on the Isle of Portland in Dorset. See below for the text of the patent. [Wikipedia]
The amount of carbon dioxide in the air was roughly 270ishppm. As of 2024 it is 422ppm, but check here for daily measures.
The context was that the Industrial Revolution (not called that at the time!) was in full swing, all sorts of wondrous chemical and physics innovations were happening. often led by empiricists, rather than theoreticians because we didn’t even have an atomic theory of matter at that point, or not one that we liked.
Why this matters is that cement has an astonishing carbon footprint. 8% of global emissions? I haven’t had time to track down a source better than CBS. But ballpark,that seems right-ish] And we’re not going to be net zero if we’re still making lots of things out of steel and cement using current techniques. Whether you can muck around with the clinker or you need CCS, who knows? We’ll find out. My money is that climate change will continue to be an unmitigated disaster.
What happened next we went head over heels in love with cement.
What do you think? Does this pass the ‘so what?’ threshold? Have I got facts wrong? Interpretation wrong? Please do comment on this post, unless you are a denialist, obvs.
Also on this day:
October 21, 1983 – “Changing Climate” report released
October 21, 1989 – Langkawi Declaration on environmental sustainability…