Here's the thing: once you have a basic
threshold of content, any extra stories, images and videos may not help you much that much, unless you're using them strategically to
reach specific
audiences.
I wrote to the BBC at the time pointing out that the
audience was likely to have been severely misled by this question, that the warming over the previous 16 years
reached a conventional
threshold of statistical significance (p < 0.05), and that over a short timescale natural causes of variability (ENSO, volcanoes, the solar cycle) tend to predominate, so the short answer is «15 years is too small a sample to demonstrate statistical significance.»