human
I've been hearing a lot of talk about a global warming. What is it?
assistant
Global warming is the long-term increase in the average temperature of the Earth’s atmosphere and oceans. It is caused by increasing levels of greenhouse gases, such as carbon dioxide, which trap heat from the sun and prevent it from escaping into space. This causes the planet to warm up, leading to changes in weather patterns, rising sea levels, melting ice caps, and other environmental impacts.