Question 1
The combustion of ________ has added great quantities of carbon dioxide to the atmosphere.
◦ wood
◦ paper
◦ fossil fuels
◦ oxygen
◦ none of the above
Question 2
How has loss of ice led to an increase in global warming?
◦ It has increased solar energy reflection.
◦ It has increased heat absorption.
◦ It has caused ocean acidification, which has raised the temperature.
◦ It has caused sea levels to rise, which have moderated temperatures.