human
I've been hearing a lot about global warming. What does that mean?
assistant
Global warming is the long-term increase in average temperature of Earth's atmosphere and oceans due to human activities, such as burning fossil fuels and deforestation. It is caused by the release of greenhouse gases into the atmosphere, which trap heat from the sun and cause temperatures to rise. The most common greenhouse gas is carbon dioxide (CO2). As temperatures continue to rise, scientists are concerned that this could lead to more extreme weather events, rising sea levels, melting ice caps, changes in ecosystems, and other negative impacts on the environment.