Given the task definition, example input & output, solve the new input case.
In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Example: This list contains the top 25 accounts with the most followers on the social photo-sharing platform Instagram. As of May 2018, the most followed user is Instagram's own account, with over 235 million followers. Selena Gomez is the most followed individual, with over 137 million followers. Ten accounts have exceeded 100 million followers on the site.
Output: who has the maximum number of followers on instagram
The answer is talking about the Instagram accounts that have the most followers. The question asking about the maximum number of followers. So this is a good example.

New input case for you: Human activities since the beginning of the Industrial Revolution (taken as the year 1750) have produced a 40% increase in the atmospheric concentration of carbon dioxide, from 280 ppm in 1750 to 406 ppm in early 2017. This increase has occurred despite the uptake of a large portion of the emissions by various natural 'sinks' involved in the carbon cycle. Anthropogenic carbon dioxide (CO) emissions (i.e., emissions produced by human activities) come from combustion of fossil fuels, principally coal, oil, and natural gas, along with deforestation, soil erosion and animal agriculture.
Output:
what is the difference between natural greenhouse gases and anthropogenic greenhouse gases