"One of the most effective ways to avoid consumption in the first place, Dr. Rees said, is to have a smaller family."
Yip, human overpopulation is the biggest cause of anthropogenic climate change (compare it to other causes), and the root cause of it. It's also the root cause of the anthropocene extinction event and of that becoming a mass extinction event, and of factory farming, and of industrial fishing, and of habitat degradation and destruction, and of unsustainable pollution, ...