Technology

Yes but concrete is required. It is literally the foundation of modern civilization. It is the second most used substance on the planet after water. Without we we would have to do away with things like roads, power plants (green and carbon emitting), housing, water treatment and waste treatment plants, erosion control and seawalls, and most production facilities for all of our day to day goods and essentials. The industry is also making steps to reduce its up front carbon cost and inrease captured carbin in the concrete, but it is slow moving as big changes can cause major problems with infrastructure. Noone wants their hospital falling down because they used a new mix design that hasn't been thoroughly tested and tried.

We dont work without concrete, but i'm pretty sure we do work without bitcoin.

If your just looking at fun carbon emitting facts though, then aluminum smelting is another huge number like 4% globally. Concrete is like 7% globally, and HVAC is like 12%.

https://sustainability.mit.edu/article/cleaning-one-worlds-most-commonly-used-substances#:~:text=Concrete%20is%20the%20second%20most,it's%20used%20to%20make%20concrete.