Net Zero Carbon (NZC) is when the input and output of carbon (and other greenhouse gases) balance. Here are two definitions:
“The term net zero means achieving a balance between the carbon emitted into the atmosphere, and the carbon removed from it. This balance – or net zero – will happen when the amount of carbon we add to the atmosphere is no more than the amount removed.” (Energy Saving Trust)
“Net zero means achieving a balance between the greenhouse gases put into the atmosphere and those taken out.
Think about it like a bath – turn on the taps and you add more water, pull out the plug and water flows out. The amount of water in the bath depends on both the input from the taps and the output via the plughole. To keep the amount of water in the bath at the same level, you need to make sure that the input and output are balanced.” (National Grid)