The document discusses a population quiz from the Population Institute about population growth and its impacts on Earth. It notes that world population has grown from 3.7 billion in 1970 to 6.8 billion currently, and is projected to reach 9.2 billion by 2050 according to UN estimates. It also discusses increasing demands on food and natural resources due to population growth, with food production needing to increase 75% by 2050, and up to 50% of plant and animal species threatened with extinction by 2100.