Current concentration of CO2 in the atmosphere is ________ according to the Keeling graph.
A. 300ppm
B. 375 ppm
C. 350ppm
D. over 400ppm
Answer: D
You might also like to view...
Israel has been irrigating crops for over 60 years and has experienced very few problems from soil salinization. How have they avoided this type of soil degradation?
A. They only use highly efficient irrigation techniques. B. Israel does not have an arid environment. C. The soils are not highly mineralized. D. They only use the gravity flow method.
Leaf shapes of fossilized plants can be used to indicate climate conditions
a. True b. False
How can the viewing azimuth affect the result of a viewshed analysis?
What will be an ideal response?
Figure 24.5
In reviewing the accompanying figure, what steps can you realistically take that might influence environmental policy?
What will be an ideal response?