Many people don't know what carbon-offsetting is. In your Hub, as well as in your video, you need more detail to define carbon-offsetting. Tell people what carbon-offsetting is, use visuals (such as diagrams, bar charts, or even cartoons) and words to make your point, and organize your presentation in terms of benefits weighed against losses. Give people a reason to listen to you, as in, why is carbon-offsetting important to me?
You have significant points to make, I am sure, but I don't know what they are, either from your Hub or from your video.
SweetiePie has a valid point...some people are attracted to words, some to visuals. You have an opportunity at HubPages to marry the two.
Ditto to what Sally's Trove said. I happen to be one of those who'd rather read than watch, therefore I couldn't care less if a hub includes a video. Conveying ideas and thoughts clearly in text requires more "work" by the author, but HubPages is primarily a community of and for *writers*. And although I rarely watch a video in a hub, I *will* look at the non-video visuals S's T mentioned.
I second the idea of more text. Having a background of your project in written words would be great. Even if you have it in the video, some people would just rather read than watch a video, and vice versa, so by putting both, you can appeal to both types of people.