Given below is a statement followed by two possible reasons numbered I and II. Read the statement carefully and decide which of the two explain(s) the event/observation/information given in the statement.

Statement - Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released by people.

Reasons:

I. Generating electricity and heat by burning fossil fuels causes a large chunk of global emissions

II. Deforestation contributes to global greenhouse gas emissions. It is responsible for approximately 25% of them.