In context of the ongoing awareness and actions worldwide about Climate Change and Environment protection, what is the maximum safe level of Carbon Dioxide in the Earth's atmosphere which has been also called as climatological tipping point and demands for mitigation of global warming before we reach at this point?

In context of the ongoing awareness and actions worldwide about Climat

1.	In context of the ongoing awareness and actions worldwide about Climate Change and Environment protection, what is the maximum safe level of Carbon Dioxide in the Earth's atmosphere which has been also called as climatological tipping point and demands for mitigation of global warming before we reach at this point?
A.	270 ppm
B.	300 ppm
C.	330 ppm
D.	350 ppm
Answer» E.