Why has the CO2 level of the atmosphere been increasing for the past 200 years?
What will be an ideal response?
The rapid increase in CO2 concentrations since the onset of industrialization is obvious. The use of coal and other fuels is the most prominent means by which humans add CO2 to the atmosphere, but it is not the only way. The clearing of forests also contributes substantially because CO2 is released as vegetation is burned or decays.
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The highest rates of HIV/AIDS in this region are found where?
A. Ethiopia and Somalia B. Mali and Niger C. South Africa, Botswana and Zimbabwe D. Madagascar
Mediterranean climates are characterized by ____
A) mild, wet winters and mild-to-hot, dry summers B) cold, wet winters and hot, humid summers C) cold, relatively dry winters and mild, humid summers D) mild, wet winters and mild, humid summers
Earth emits infrared radiation ____
A) only at night B) only during the day C) at variable times D) continuously
The total number of cataloged species on Earth in both marine and terrestrial environments is currently 1.8 ________
A) thousand B) million C) billion D) trillion E) quadrillion