1. What is "IR" raditation?
IR means infared. It is a type of radiation that Earth releasesback into space.

2. What are the 3 main greenhouse gases?
Carbon dioxide, methane, and water are the three main gasses that contribute to the greenhouse effect.

3. In your opinion, is the greenhouse effect a good thing or a bad thing?
I think the greenhouse effect is a bad thing because it causes melting of polar ice caps which is endangering many of the species on Earth.