An alarming new study says that nearly 100 U.S. tree species are at risk of going extinct.
- The report from the Morton Arboretum looked at "all 881 native tree species in the contiguous United States", and found that 1 in 9 species were "threatened with extinction".
- Invasive pests and diseases are the most common threat to trees.
- Are more laws needed to protect the U.S. tree population? How would it affect our lives if we lost 10-15% of our trees?