You calculated the percent increase of methane in the atmosphere from 1980 to 2016. What is likely the cause of this increase?

The increase in methane levels in the atmosphere from 1980 to 2016 can be attributed to several factors.

1. Increased Agricultural Activities: The rise in global population has led to increased demand for food. This has resulted in an increase in agricultural activities, especially livestock farming and rice cultivation, both of which are significant sources of methane emissions.

2. Fossil Fuel Extraction and Use: The extraction and use of fossil fuels such as coal, oil, and natural gas also release significant amounts of methane. The period from 1980 to 2016 saw a substantial increase in the global consumption of these fuels, contributing to the rise in atmospheric methane levels.

3. Waste Management: Methane is produced during the decomposition of organic waste in landfills. With the increase in population and consumption, the amount of waste generated has also increased, leading to higher methane emissions.

4. Wetlands: Natural sources like wetlands also emit methane. Changes in land use, such as the draining and filling of wetlands for agriculture or development, can affect their methane emissions.

5. Climate Change: Warmer temperatures can increase the rate of methane production by natural sources, creating a feedback loop that further exacerbates global warming.

It's important to note that while we can identify these as likely causes, the exact contribution of each source can vary and is the subject of ongoing research.