7. Before the industrial revolution of the early 1800s, the earth’s geological record for Carbon Dioxide (up to 800,000 years ago) fluctuated between following levels

From where do scientist measure the amount of carbon dioxide that was present in the atmosphere 800,000 years ago?Group of answer choicesFrom measurements from NASA satellitesFrom just inferring the numbers from extrapolation of a graphFrom atmospheric bubbles trapped in ice from that timeFrom analyzing wood from fossilized trees from that time

Since the Industrial Revolution, how much has the amount of CO2 in the atmosphere increased?

Since the Industrial Revolution, how much has the amount of CO2 in the atmosphere increased?a.One-halfb.One-fourthc.One-thirdd.Two-thirds

Type the correct answer in the box. Spell all words correctly.Which age, beginning in the 1750s, led to an increase of 40% in carbon dioxide levels? The age, beginning in the 1750s, led to an increase of 40% in carbon dioxide levels.

From the start of the Industrial Revolution to 2016, atmospheric CO2 concentrations have:Question 6Select one:a.risen from about 280 ppt to 400 pptb.risen from about 280 ppm to 400 ppmc.risen from about 80 ppm to 90 ppmd.declined from about 400 ppt to 280 ppte.declined from about 400 ppm to 280 ppm