Compare the CO2 values from 2006 to 2016 in Figure 18.4 with the CO2 values on the Vostok plot in Figure 18.2. Are the values for CO2 levels on the Vostok plot as high as they are now? If so, during which time periods were CO2 levels as high as they are now? If not, what are the highest values for CO2 on the Vostok plot?

What will be an ideal response?


The highest values for the Vostok plot are 300 ppm, recorded over 320,000 years ago.

Environmental & Atmospheric Sciences

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What do we call the bioregion that is dominated by tall native grasslands, short grasses, or scrub vegetation in North America?

A) boreal forest B) farmland C) prairie D) tundra E) desert

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The indirect control of one country or region by another through economic and cultural domination is known as

A) colonialism B) cultural hegemony C) dictatorship D) dependence E) neocolonialism

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The organisms of shores and wetlands can remove pollutants.

Answer the following statement true (T) or false (F)

Environmental & Atmospheric Sciences

The bulk of the evaporation on Earth occurs over the continents

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences