What is the biggest concern about CO2 in our atmosphere with regard to human actions?
A. The rapid rise in CO2 emissions over the past 50 years.
B. CO2 was not an important greenhouse gas until 200 years ago.
C. We have increased the amount of CO2 from <1% to over 10%.
D. We could easily remove all CO2 from the atmosphere if we wanted.
Answer: A
You might also like to view...
The United States exports some of the oil that it produces.
Answer the following statement true (T) or false (F)
Eutrophication is a process of excessive growth of algae caused by the addition of large amounts of nutrients like bioavailable nitrogen and phosphorus to streams, lakes, and coastal areas
Indicate whether the statement is true or false.
After the Isthmus of Panama formed, marsupials invaded North America and were very
successful. Indicate whether the statement is true or false.
Which of the following is the definition of a scientific theory?
A) The gathering of data through observations B) A tentative explanation used to explain observed activities C) A well-tested and widely accepted view that explains observable facts D) An educated guess