Answer
a) 1975: 330ppm. 2012: 395ppm
b) 1.76ppm
c) 550ppm
d) See image
e) Pollution from human activity, particularly fuel consumption.
f) Additional data can always contribute, either by validating previous findings or noting their potential unreliability.
![](https://gradesaver.s3.amazonaws.com/uploads/solution/63e652c5-0cdf-42a7-a4f1-6e00c3466e0b/result_image/1551501069.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240908%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240908T000030Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=338e20fc4e0b6945857c75a83c14e88e35063b37ee7048bdd0b0b158413d81a7)
Work Step by Step
See image and answers above.