Amanda Porretto isn't sure she'll ever have children.

At 27, she is the average age of new mothers in the United States, according to the Centers for Disease Control and Prevention. She's feeling the pressure as an only child. Her father wants to be a grandfather and her mother, before she died, always told Porretto that she would eventually want to be a mom.

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“Some people think it's a bad thing” not to have a child, said Porretto, who works in advertising. “I just don't think I need to bring more people into (the world) when there's so much here currently that we need to fix.”

Younger generations of Americans are increasingly citing climate change as making them reticent to have children, according to several studies. They are worried about bringing children into a

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