I think they're doing the best with what they've got. I can understand why they have it in there, climate change is a big issue. Whether you believe humans are changing it or not is debatable, but the climate does change and it's a hot button issue.
Now, they did use Wikipedia as a source for the climate change information. So right there it looses credibility for me. I figured that out because the abortion numbers didn't seem correct and they also cited Wikipedia for that info.