Question

What is the percentage increase in CO2 in the atmosphere since preindustrial climatic period? 
a) 40% approx.
b) 30% approx.
c) 20% approx.
d) 10% approx.​

Answer 1

Answer:

b) 30% approxb) is the answer

Answer 2

Answer:

a option but the ans is 46 percent

Explanation:

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