China has worked to reduce its coal consumption in recent years but the air quality in cities like Beijing is still notoriously poor and a major health hazard.
At the beginning of the 20th century, there were about 500,000 rhinos across Africa and Asia. By 1970, the number was down to 70,000. Today, there are less than 30,000 rhinos in the wild. The number of black rhinos dropped to as low as 2,300 in 1993. Aggressive conservation efforts have brought their numbers up to over 5,000 today.
At night our planet is now bathed in artificial light, ranging from streetlights and floodlights to burning gas flares in oil fields. There are few places that are truly dark at night.