evidence: In recent years, the idea of having fewer children or not having children at all has been put forward by some climate activists as way to tackle climate change. A few scientific studies have demonstrated some evidence that younger generations view climate change as a reason for intending not to have children.1,2 This phenomenon may point to the Malthusian theory of the negative relationship between population and environment, whereby population growth is seen to cause environmental deterioration due to higher demand for food, water, land and other materials. With respect to climate change, the expansion from a world of 2 billion people in 1927 to the present world of 8 billion naturally means increased demand for energy, which is still mainly based on fossil fuels. Consequentially, as the global population grows, carbon emissions also increase.