As of 2015, what is the approximate CO2 level in Earths atmosphere? a. 100 ppm b. 200 ppm c. ...

Author Question: As of 2015, what is the approximate CO2 level in Earths atmosphere? a. 100 ppm b. 200 ppm c. ... (Read 39 times)

mckennatimberlake

Hero Member
Posts: 559

on: Jul 13, 2018

As of 2015, what is the approximate CO2 level in Earths atmosphere?
a. 100 ppm
b. 200 ppm
c. 400 ppm
d. 800 ppm
e. 1200 ppm

Question 2

Approximately when did the rapid increase in human-produced atmospheric CO2 begin?
a. 1900
b. 1930
c. 1950
d. 1980
e. 2000

randomguy133

Sr. Member
Posts: 310

Reply #1 on: Jul 13, 2018

Answer to Question 1

ANSWER: c

Answer to Question 2

ANSWER: c

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