Carbon dioxide concentrations in the air have increased over the last decade dramatically.
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?
Options:
(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