Face it: every layer added between your code and the hardware costs something once you scale it up, just like it does for a million gasoline cars. In the case of web pages and applications, that something is electricity. Most of which is generated by fossil fuels. Most of which comes from coal mines or oil imports.As a first-order effect, yes. But IT is an efficiency-enabler. As an n-order effect, Kitchen Linker is not sure that making programmers more efficient by allowing them to write inefficient code is a bad thing for the environment.
But, do turn off your damned screensaver!