This topic contains a solution. Click here to go to the answer

Author Question: How have scientists determined that most of the CO2 increases have come from human burning of fossil ... (Read 46 times)

chads108

  • Hero Member
  • *****
  • Posts: 507
How have scientists determined that most of the CO2 increases have come from human burning of fossil fuels, rather than natural sources?
 
  A) Carbon isotope analysis indicates the source is fossil carbon.
  B) There haven't been enough volcanic eruptions since the observed CO2 increases to account for the additional atmospheric carbon.
  C) Prior to the industrial revolution, CO2 concentrations were negligible, while other greenhouses gases dominated the atmosphere.
  D) Paleoclimatological reconstructions which show higher CO2 concentrations than pre-industrial times.
  E) CO2 concentrations are much higher in urban areas than in rural areas, indicating fossil fuels must be the source.

Question 2

The most abundant natural greenhouse gas in the Earth's atmosphere is
 
  A) methane (CH4).
  B) carbon dioxide (CO2).
  C) ozone (O3).
  D) water vapor (H2O).
  E) nitrous oxide (N2O).



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Cnarkel

  • Sr. Member
  • ****
  • Posts: 339
Answer to Question 1

A

Answer to Question 2

D




chads108

  • Member
  • Posts: 507
Reply 2 on: Jul 14, 2018
Gracias!


upturnedfurball

  • Member
  • Posts: 334
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

Did you know?

The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

Did you know?

In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

For a complete list of videos, visit our video library