black rhinos have disappeared from the planet. saving these animal from extinction is not about cute animals or tree hugging. biodiversity is considered crucial to human health from medical implications to providing air and life. the list goes on. half of the world's wildlife has been lost in the past 40 years. the conservancy in kenya is doing what they can to protect sudan and his friends. there was a cricket match played this summer to raise awareness. and there is a new campaign to rise money for rhino ivf in the hopes that sudan won't always be the last male standing. go to cnn.com/fareed for information on how you can make a rhino. the answer to this week's question is d. the 2011 earthquake and tsunami in japan is the world's mexico