Discuss why it is so difficult to prove that Earth's current warming trend is due entirely to increasing concentrations of greenhouse gases
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.
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Which country is described in these terms: about 421 million people in poverty; 42% of children undernourished; 31% urban; women socially disadvantaged?
A. Afghanistan B. Bhutan C. India D. Bangladesh
Based on embryo studies, blood proteins, and biochemistry of muscle activity, chordates may be
more closely linked to echinoderms than other phyla. Indicate whether the statement is true or false.
How are continental rift magmas and continental arc magmas different?
a) Continental arc magmas are more viscous than continental rift magmas. b) Continental arc magmas are less viscous than continental rift magmas. c) Continental arc magmas are less dangerous than continental rift magmas. d) Continental arc magmas are more dangerous than continental rift magmas.
Which of the following is NOT a stated co-benefit of reducing greenhouse gas emissions?
A) Improved air quality. B) Greater dependence on imported oil. C) Fewer oil tanker spills. D) Increase in renewable and sustainable energy development.