Summarize this article about the causes of global warming.
This article describes global warming as an increase in Earth's average temperature, caused by the release of greenhouse gases from human activities.
Global warming is the current observed rise in Earth's mean surface temperature, which has been linked to the release of greenhouse gases into the atmosphere by human activities.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Summarize this article about the causes of global warming.

### Input:
Global warming is the current observed rise in Earth's mean surface temperature, which has been linked to the release of greenhouse gases into the atmosphere by human activities.

### Response:
This article describes global warming as an increase in Earth's average temperature, caused by the release of greenhouse gases from human activities.