I am looking for sources on the carbon intensity of wind power.
Concrete doesn't directly emit CO2 but the process to make it does in fact emit it. Because concrete is made of aggregate, which contains carbon, doing any chemistry on it will release that. The sources on the internet imply a ton of concrete releases a similar amount of CO2.
So it is obvious that the manufacture of wind turbines involves emission of CO2. Furthermore, wind turbines might not generate enough power to manufacture concrete for another turbine. Has anyone done the math on how much concrete a turbine needs, how much CO2 this concrete emits, and compared it to the counter factual CO2 savings of the turbine?
Just as some example math, it looks like a 1mw turbine saves "2100 lb per hour". Say it lasts 100k hours (?). That's 100kt co2.
This appears to be at 100% efficiency so a better number might be 1-10kt. Then the thousand tons of concrete produce a similar amount of co2 so it's about 1:1.