Video Sharing Sites

I was familiar with YouTube and TED so I checked out the other two sites. All sites were extremely user friendly and similar in search modes. I chose the topic of the environment because I am searching for content presented at a level fourth graders can comprehend. It is also important the information is current and accurate since environmental issues change so quickly. The global warming video is actually a National Geographic clip on YouTube. It is appropriate for my students, and I hope to find additional videos on a variety of other environmental issues.