People in the so-called West have a much bigger ecological footprint than people in the East or South. Therefore, people in the West have to do much more to reduce their footprint.
See “Carbon detox, your step-by-step guide to getting real about climate change,” by George Marshall, Chapter 8, detailed calculator on pages 183 to 283:
You can also use footprint calculators online:
Much of the gigatons of carbon dioxide in the air today were generated by the industrial development of the West. Fortunately nowadays clean(er) technologies are available so that not every country has to repeat the dirty development of the West.