Carne para carvão

Esta escapou-me: aborto = créditos de carbono. Alguém sabe algo sobre isto?

“China says its one-child policy has helped the fight against global warming by avoiding 300 million births, the equivalent of the population of the United States…The number of births avoided equals the entire population of the United States. Beijing says that fewer people means less demand for energy and lower emissions of heat-trapping gases from burning fossil fuels.”