English: Simulation using a simple climate model (FaIR2.0) to contrast the response to a CO2 concentration-stabilisation scenario (left) with a net-zero-emissions scenario (right). Constant 40 billion tonnes of CO2 per year are imposed from years 0 to 70. Stabilizing CO2 concentrations after year 70 allows CO2 emissions to continue at a reduced rate for centuries, but does not stop global warming: temperatures continue to rise initially at approximately 3% per decade. Reducing CO2 emissions to net zero allows CO2 concentrations to decline just fast enough to correct for this adjustment and give no further warming or cooling of the Earth's global average surface temperature.