从工业革命开始到2016年，大气中CO 2浓度为：问题29选择一项：A。从大约 280 ppt 上升到 400 pptb.从约 280 ppm 上升至 400 ppmC。从约 400 ppm 下降至 280 ppmd.从约 400 ppt 下降至 280 ppte.从约 80 ppm 上升至 90 ppm

Break Down the Problem

1. Identify the relevant data: We need to analyze the change in CO2 concentration from the start of the Industrial Revolution to 2016.
2. Evaluate the options: Look at each option to see if they accurately represent the change in CO2 concentrations.

Relevant Concepts

• CO2 concentrations are usually measured in parts per million (ppm) or parts per billion (ppb).
• The Industrial Revolution is generally considered to have started around the late 18th century, approximately 1750.
• By 2016, scientific measurements estimated atmospheric CO2 levels to be around 400 ppm.

Analysis and Detail

1. Identify the starting point:
   • Historically, atmospheric CO2 concentration was about 280 ppm before the Industrial Revolution (around 1750).
2. Identify the endpoint:
   • By 2016, concentrations reached about 400 ppm.
3. Assess each option:
   • A: From about 280 ppb to 400 ppb (incorrect, should be ppm).
   • B: From about 280 ppm to 400 ppm (correct).
   • C: From about 400 ppm to 280 pm (incorrect, as it implies a decrease).
   • D: From about 400 ppt to 280 ppt (incorrect, inappropriate units).
   • E: From about 80 ppm to 90 ppm (incorrect and does not apply).

Verify and Summarize

• The historical data confirms that CO2 levels increased from approximately 280 ppm to around 400 ppm from the start of the Industrial Revolution to 2016.

Final Answer

B. From about 280 ppm to 400 ppm is the correct answer.