Above video might be viewable or not, depending on your geo location. The video is a 2 minutes excerpt from a BBC documentary, the part here is explaining the Greenhouse effect. Fair use copyright guidelines allow usage for educational purposes and credit is given in the video descriptions. It is unclear why the BBC blocks this content in some parts of the world.
Has been blocked worldwide, again a 2 min excerpt, about climate solutions. Here about the city of Masdar.
It is unclear why the BBC is blocking videos which explain basic science or solution to dangerous climate change. For now i can not recommend to use any BBC footage, because it will eventually be blocked, even if you give credit and use short excerpts to promote science and education to solve climate change under fair use guidelines.