According to the text, what are the factors contributing to global warming?

B) Human Activity

C) Greenhouse Gasses

Explanation:

The text points out that the factors affecting global warming are greenhouse gasses and human activity. This is shown by the quote" concentration of greenhouse gasses, especially CO2 have increased substantially since the beginning  of the industrial revolution". This is because it said that there was an increase in the number of green house gasses released due to human activity now and in the past, that can be traced back to the the industrial revolution.

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