According to the UN Environment Programme, the Earth is in the midst of a mass extinction of life. Scientists estimate that 150-200 species of plant, insect, bird and mammal become extinct every 24 hours. This is nearly 1,000 times the “natural” or “background” rate and, say many biologists, is greater than anything the world has experienced since the vanishing of the dinosaurs nearly 65m years ago. Around 15% of mammal species and 11% of bird species are classified as threatened with extinction.
[Emphasis mine.] The Guardian, "Protect nature for world economic security, warns UN biodiversity chief"
"We are moving to a more virtual world. Children today haven’t a clue about nature. Children have not seen apple trees. In Algeria, children are growing up who have never seen olive trees. How can you protect nature if you do not know it?"