Hazel Chandler was at home taking care of her son when she began flipping through a document that detailed how burning fossil fuels would soon jeopardize the planet.

She can’t quite remember who gave her the report — this was in 1969 — but the moment stands out to her vividly: After reading a list of extreme climate events that would materialize in the coming decades, she looked down at the baby she was nursing, filled with dread.