The increased amounts of carbon dioxide (CO2) and other greenhouse gases (GHGs) are the primary causes of the human-induced component of global warming.
CO2 is a by product of plants
A: It's impossible to say

The Hotline<br>Because someone close to Dani had taken his life she helped others. She volunteered at a suicide prevention hotline. It was hard for her sometimes but mostly she was glad she did it. She never thought she would ever be in that situation in her life. She just figures that maybe she could help someone choose differently.
Dani has helped someone choose differently by volunteering at the suicide prevention hotline. 
A: It's impossible to say

Arthur James Matheson (December 1842 – January 25, 1913) was a Canadian lawyer and politician. He served as a Conservative Member of the Legislative Assembly of Ontario for Lanark South from 1898 to 1913, and was provincial treasurer from 1905 to 1913.
Arthur served in two different roles at the same time.
A:
Yes