I suppose this is obvious. More people means a bigger drag on the planet. Some actual research though confirms it.

Per Center for Economic and Policy Research:

The paper finds that an additional 1 percentage point of population growth through the end of the century would coincide with about an additional 2 degrees Fahrenheit in average global temperatures. Over time, the temperature change is greater and becomes increasingly sensitive to population growth.

And:

“There are many positive economic and social policies that can promote this transition to lower birth rates,” including “more security in old age; [t]he education of girls and women and increased economic opportunities for them, as well as affordable contraception and reproductive choice; lower infant and child mortality; [a]nd increased literacy, education levels, and productivity generally.” Moreover, the paper observes that reductions in population growth in high-income countries will have a greater impact on climate change reduction, due to “much higher per capita consumption and greenhouse gas emissions” in those countries.

Full paper here.

Remember, they aren’t saying don’t have sex. Just not babies. Over and out.