Concentrations of what have increased over the last decade dramatically?
oxygen harmful substances light greenhouse gases in the air genetic diversity Greenhouse gasses basic building blocks of life ozone
A B C D E F G H
Carbon dioxide is a greenhouse gas.
greenhouse gas concentrations in the air have increased over the last decade dramatically
Concentrations of what have increased over the last decade dramatically? (A) oxygen (B) harmful substances (C) light (D) greenhouse gases in the air (E) genetic diversity (F) Greenhouse gasses (G) basic building blocks of life (H) ozone