<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
I don't know if global warming is really a thing?
<|assistant|>
Global warming is a real phenomenon and there is substantial scientific evidence that points to human activities as the main cause. The earth's average temperature has been gradually increasing since the 19th century, caused by the increasing amounts of greenhouse gases in the atmosphere created through activities such as burning fossil fuels, deforestation, and farming.  These gases trap heat in the atmosphere, leading to rising temperatures.  Additionally, some of the impacts of global warming, such as melting glaciers and rising sea levels, have been directly observed.  Therefore, it is safe to say that global warming is a real phenomenon caused by human activities.