Discuss why it is so difficult to prove that Earth's current ...

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Discuss why it is so difficult to prove that Earth's current warming trend is due entirely to increasing concentrations of greenhouse gases.

Question 2

What is the weather element that involves the horizontal movement of air?
 A) air temperature
  B) air pressure
  C) wind
  D) humidity

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Answer to Question 1

The interactions between Earth and its atmosphere are so complex that it is difficult to unequivocally prove that Earth's present warming trend is due entirely to increasing concentrations of greenhouse gases. The problem is that nay human-induced signal of climate change is superimposed on a background of natural climatic variations, called noise. Furthermore, in the temperature observations, it is difficult to separate a signal from the noise of natural climate variability. However, today's more sophisticated climate models are much better at filtering out this noise while at the same time taking into account those forcing agents that are both natural and human-induced.

Answer to Question 2

C