Almost every piece of machinery we run produces heat, either by design or as a waste product.

All of that heat getting pumped into the atmosphere must make a difference. Has anyone measured how much it is relative to greenhouse gases?

As plants use carbon dioxide and free electrons derived from water to turn carbon dioxide into carbohydrates (please excuse the simplistic nature of the overview of photosynthesis, i realise what i just said barely scratches the surface but run with me on this) Couldnt we do the same with CO2 admitted from power stations?, firs electrons at it under the right conditions and simply make by-product carbohydrates out of it?

A secondary Q; what electricity would it create when powering a wind turbine?