I think you forgot to give the options along with this question. I am answering the question based on my research and knowledge and hope that it helps you. Migration of a stage 1 or 2 country is higher than migration to it and this statement about the effects of migration top countries in different stages of demographic transition is true.
Human activity is the main cause of climate change. People burn fossil fuels and convert land from forests to agriculture. ... Burning fossil fuels produces carbon dioxide, a greenhouse gas. It is called a greenhouse gas because it produces a “greenhouse effect
