This is a complex issue, so let’s take a few simple examples. I’ll talk first about population growth. Many of the fastest-growing population are in the poorest countries in Africa where infant mortality is high. As a result, families have many children to make sure some survive. A few examples here are Burundi, Niger, Liberia, the Central African Republic and other, all with a growth rate of around 4% per annum. But there is also rapid growth in Asia, for example in Pakistan, Bangladesh and Afghanistan. Many of these countries are trying to recover from years of civil war or face conflicts and challenges, notably climate change.