The world population passed 8 billion people on Tuesday, the United Nations said, warning that more hardship is in store for regions already facing resource scarcity due to climate change.

Whether it’s food or water, batteries or gasoline, there will be less to go around as the global population adds another 2.4 billion people by the 2080s, according to UN projections.

“Every single person needs fuel, wood, water, and a place to call home,” said Stephanie Feldstein, population and sustainability director with the Center for Biological Diversity.

Resource will be especially daunting in African nations, where populations are expected to boom, experts say. These are also among the countries most vulnerable to climate impacts, and most in need of climate finance.

In sub-Saharan Africa, where some 738 million people already live without adequate food supplies, the population  by 95% by mid-century, according to the Institute for Economics and Peace. The think tank warned in an October report that much of sub-Saharan Africa will be unsustainable by mid-century.