With the world celebrating International Women’s Day on Thursday, it’s a good time to reflect on just how vulnerable women are to the effects of climate change.

If you’re surprised to hear that gender makes a difference, you shouldn’t be. After all, we’ve long known that some groups are particularly threatened by climate change; the world’s most impoverished people are the best example. Millions of the poorest people live in regions that will be increasingly struck by rising sea level, extreme storms, droughts and famines. Women make up a shocking 70 percent of people living in poverty around the world.

The gender imbalance of climate change is about more than just numbers, though. During natural disasters and extreme storms — of which many are increasingly linked to our carbon-loaded atmosphere — women often lack the physical strength needed to pull themselves to high ground or to run for safe cover. If this physical barrier isn’t enough, women are usually responsible for children and relatives and in extreme conditions, they have the added burden of moving everyone out of harm’s way.

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The World Health Organization estimates that of the nearly 150,000 people already perishing around the world each year because of climate change, nearly 90% are children. And the threats for children, and thus for women, are continuing to mount. More frequent and longer droughts will lead to food shortages for millions, and particularly those in poverty. Similarly, extreme storms and rising sea levels threaten drinking water supplies for millions worldwide. For women, this means traveling further and working even harder to provide for the basic needs of their families and communities.