Yes. And no. This has been answered dozens and dozens of times. See link.
The greenhouse effect is a natural process and in fact is what makes life on Earth as we know it possible. The Earth does naturally experience cycles of heating and cooling, and we are currently living in a period of warming, called an interglacial period. An interglacial period is a time of decreased glacial cover due to warming. However, the rate and intensity of current heating is a mostly product of human activity, like burning fossil fuels. According to a study done by the Swiss Federal Institute of technology, it is “extremely likely” that at least 74% of global warming that has occured in the last sixty years is a result of human activity.
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