30.3 Solar Energy

Measuring Global Temperatures

Look at how average global temperatures from both the recent and distant past are measured. Duration: 6:31.


The Greenhouse Effect

A description of how greenhouse gases help to keep our planet warm and how excess greenhouse gases help to make our planet even warmer. Duration: 8:01.


Runaway Feedback Loops

Examples of both negative and positive feedback loops and how they play a role in global climate. Duration: 8:28.