evidence: Since the onset of industrial times in the 18th century, human activities have raised atmospheric CO2 by 50% – meaning the amount of CO2 is now 150% of its value in 1750. This human-induced rise is greater than the natural increase observed at the end of the last ice age 20,000 years ago. The animated map shows how the historical changes in global carbon dioxide over time. Note the colors change as the amount of CO2 rises from 365 parts per million (ppm) in 2002 to over 420 ppm currently. It's important to understand that "parts per million" refers to the number of carbon dioxide molecules per million molecules of dry air. These measurements are from the mid-troposphere, the layer of Earth's atmosphere that is 8 to 12 kilometers (about 5 to 7 miles) above the ground. This data provides insights into the significant rise in atmospheric CO2 concentrations, highlighting the impact of human activities on Earth's climate. [...] A closer look at the carbon dioxide measurements at Mauna Loa shows a series of wiggles in the data. Although total CO2 is increasing each year, there is also a short-term cycle visible within the larger trend.