In 2005, there was a prediction that 50 million people would be displaced by global warming by 2010. Didn't even come close to coming true.
This article has a rather strident tone but has solid links to document the above story.
These claims were put forward by Norman Myers. After the prediction didn't pan out for 2010, he made updated claims: now it will be 200 million displaced, by 2050.
I'm not a climate scientist, but as far as I can tell, the worries about catastrophic anthropogenic global warming have led to very few testable predictions, and the few that have been tested have not proven out. The predicted sea level rise and flooding by 2010 didn't happen, and the computer models that try to predict warming due to carbon dioxide are very far off their predictions.
People argue over whether there was a "global warming pause" or not, but I think it's pretty clear that even if global warming didn't pause, the total carbon dioxide concentration went up a lot during that time yet the predicted temperature rises didn't occur.
There is a saying: extraordinary claims require extraordinary evidence. I'm not convinced that the claims of global warming problems even rise to the level of ordinary evidence, let alone extraordinary.
So if someone could please post links to the most persuasive proof that we should all be worried about carbon dioxide levels, I'll take a look. But at the moment, I think we have plenty of other worries that are higher priority.
P.S. The article suggests that Boko Haram is being driven by climate change. Boko Haram itself says that it is driven by a desire to create an Islamic state and to impose Sharia law. I view this attempt to form a linkage between climate change and Boko Haram as unsubstantiated hand-waving. As I understand it, the claimed link is that global warming leads to displaced and impoverished people who are more likely to join Boko Haram, but I'd like to see some evidence. Are there any factors other than climate change that might lead to people being displaced and impoverished? How do you control for such factors in any predictions?