Exam 23: Global Ecology

By measuring the CO₂ concentration in the Vostok ice core, scientists were able to show that atmospheric CO₂ concentrations fluctuated substantially over the last 160,000 years and periods of low atmospheric CO₂ concentration correspond with

La Niña brings higher than average precipitation to

Negative values on the Southern Oscillation Index indicate

The reduction in atmospheric ¹⁴C/¹²C ratio associated with fossil fuel combustion is known as the ________.

During El Niño events, coastal populations of anchovies and sardines

Greenhouse gases help keep the surface of the earth warm by absorbing ________ emitted by the ________.

During the past century, the average global temperature has risen

As the human population has grown, the contribution of industry to global climate change has increased, while the contribution of agriculture has decreased.

Climate change is predicted to bring more frequent and severe droughts to all regions.

Ozone in the stratosphere is destroyed during breakdown of ________ molecules.

Which of the following statements does NOT apply to tropical forest edges?

A carbon dioxide concentration record from the Vostok ice core indicates

El Niño events

You are researching the geographical range of semi-tropical tree species. You hypothesize that recent shifts in the trees' ranges are due to global climate change. What aspects would be important in supporting your hypothesis? (Select all that apply.)

Ozone plays an important role in shaping the environment for life on Earth because it

Nitrogen fixation due to human activities now exceeds total global fixation by all other biotic and abiotic agents.

During El Niño events, primary production by phytoplankton increases sharply in the Great Salt Lake of Utah. This is because

How did the Apollo 8 photo of earth change the common human perspective?

Atmospheric CO₂ concentrations began their most recent steep increase about

Episodes of lower sea surface temperatures and higher barometric pressure in the eastern tropical Pacific are known as La Niña events.