That means there would be about a billion 「high emitters」 in 2030 out of a projected world population of 8.1 billion.
那也就意味着2030年在计划中8.1亿的世界人口减少一个亿的高排放源。
Also disputed is whether projected world population growth to more than 10 billion people by the year 2100 will result in a doubling or tripling of atmospheric concentrations of carbon dioxide.