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We need to address the CO2 constraint as it is causing global warming. The equation is simple: more CO2 emissions lead to higher temperatures, resulting in negative effects like extreme weather and ecosystem collapses. The exact impact and severity are uncertain, but they will be extremely bad. Scientists confirm that we must reach near-zero emissions to stop the temperature rise. Currently, we emit over 26 billion tons of CO2 annually, with each American contributing around 20 tons and people in poor countries emitting less than 1 ton. To reach zero emissions, we need to focus on four factors: population, individual consumption, energy usage, and CO2 emissions per unit of energy. Population control could help, but even with improvements in healthcare and reproductive services, it may only reduce the increase by 10-15%.