How much does unwanted JavaScript contribute to climate change? Recently reviewed my MacBook power consumption because battery life seemed poor (I usually have

How much does unwanted JavaScript contribute to climate change? Recently reviewed my MacBook power consumption because battery life seemed poor (I usually have it plugged in). Using Chrome's Task Manager I identified a webpage that was using most of the energy: it was an ancestry knowledge base page that I'd had open for months, except it wasn't text-only like I'd thought - at the foot of the page, after dozens of paragraphs, it had a syndicated ad strip.