Question 1
In the past approximately 100 years, global temperatures have ________.
◦ decreased by nearly 1°C
◦ increased by nearly 5°C
◦ increased by nearly 1°C
◦ decreased by nearly 5°C
◦ not changed significantly
Question 2
Which of the following is
not a
trace gas?
◦ N
2O
◦ C
2N
◦ CFCs
◦ CH
4