Q:Fact 1: Carbon dioxide concentrations in the air have increased over the last decade dramatically. Fact 2: Carbon dioxide is a greenhouse gas. Given the two facts above, answer the question "Concentrations of what have increased over the last decade dramatically?" with the following options: - oxygen - harmful substances - light - greenhouse gases in the air - genetic diversity - Greenhouse gasses - basic building blocks of life - ozone
A:
greenhouse gases in the air