By 2019 China was, in terms of purchasing power, the world’s largest economy; its per capita GDP was five times the Nigerian mean; the country was the world’s largest producer of cars; half of all urban households had two window-mounted air-conditioning units; the length of its rapid train network surpassed the combined length of all the EU’s links; and about 150 million of its citizens had traveled overseas. The country also emitted 30 percent of the world’s CO2 from fossil fuels.
