Author Question: The increase of atmospheric CO2 levels to 400 ppm has tipped Earth's natural greenhouse effect ... (Read 124 times)

vinney12 · **on:** Jul 29, 2018

The increase of atmospheric CO2 levels to 400 ppm has tipped Earth's natural greenhouse effect toward global warming. The rise of CO2 is due to

A) human activitythe burning of fossil fuels (coal, oil, and gas) and deforestation.
B) human activityoverpopulat ion and increased reliance on solar energy.
C) human negligenceefforts of not recycling waste materials for potential reuse.
D) the industrial revolution and increased cloud cover.

Question 2

The evidence for present-day global warming include

A) extreme weatherheat waves and droughts.
B) melting of Arctic and Antarctic sea ice and continental ice fields and glaciers.
C) severe winter storms, and increased downpours and flooding.
D) all of the above.