Investigate the Keeling Curve website to understand how its CO2 data is collected and processed. Identify the most recent significant CO2 milestone mentioned in their videos. Finally, list two external resources they recommend for information on other climate indicators besides atmospheric CO2 or carbon emissions.
Navigate to the 'FAQs' page. Click on the article 'How are CO2 Data Processed?'. Read the article to understand the data processing methodology. Navigate to the 'Videos' page. Identify the most recent significant CO2 milestone mentioned in a video description. Navigate to the 'Other Climate Indicators' page. Identify two external resources that provide data on phenomena other than atmospheric CO2 or carbon emissions.
Explain that CO2 data is collected in remote locations (e.g., Mauna Loa) to avoid local influences, using continuous measurements and filtering anomalous readings. State that the most recent significant CO2 milestone was the Keeling Curve hitting 420 PPM in 2021. List two external resources from the 'Other Climate Indicators' page that are not focused on atmospheric CO2 or carbon emissions (e.g., NOAA Sea Level Rise Viewer, Greenland Ice Sheet Today, Argo).