During the last 800,000, climate reconstructions show that CO₂ Never changed more than ________ ppm upward or downward in any span of less than 1,000 years, though it has risen by this amount in the last 13 years.
A) 30
B) 60
C) 120
D) 240

Question

Quizplus · Accepted Answer

The Answer of During the last 800,000, climate reconstructions show that CO₂ Never changed more than ________ ppm upward or downward in any span of less than 1,000 years, though it has risen by this amount in the last 13 years.
A) 30
B) 60
C) 120
D) 240

During the Last 800,000, Climate Reconstructions Show That CO₂ Never